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题库 / Prep2007E1-SC-3
Less than 35 years after the release of African honeybees outside Sao Paulo, Brazil, their descendants, popularly known as killer bees, had migrated as far north as southern Texas.
Less than 35 years after the release of African honeybees outside Sao Paulo, Brazil,
In less than 35 years since releasing African honeybees outside Sao Paulo, Brazil,
In less than the 35 years since African honeybees had been released outside Sao Paulo, Brazil,
It took less than 35 years from the release of African honeybees outside Sao Paulo, Brazil, when
It took less than the 35 years after the time that African honeybees were released outside Sao Paulo, Brazil, and then
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this is a tricky one.
if you were narrating in the present tense, you'd say the following: 'as of today, the bees have migrated as far north as southern texas.' therefore, since this sentence describes a situation in the past (it describes the situation 35 years after the release, which is before the present), you translate all present-tense verbs into the past tense. this turns 'have migrated' into 'had migrated'.
there is no explicit description of the 'second event' you're looking for in this problem, which is what makes it difficult. instead, the 'second
event' is the point on the timeline, 35 years after the release of the bees. because the sentence describes a trend whose relevance continues up to and through that point, a perfect tense is appropriate.
wrong answers:
*
choice b implies that the honeybees' descendants somehow released them
(perhaps a very bizarre case of karmic cycles, but absurd no matter
what).
* choice c: 'the 35 years since' implies that the present
is 35 years after the release date. not only does this conflict with
the meaning of the original, but it also renders the past perfect (from
the underlined part) inappropriate: you'd need present perfect in this
case. also, since the release is a point event, it would belong in the
simple past.
* choice d: in this sentence, the commas +
non-essential modifier ('..., when') seem to imply that the
descendants' migration took place simultaneously with the release of
the original honeybees. in addition, in this sentence, 'it' refers to
some unspecified event (it can't refer to the descendants' migration,
for the aforementioned reasons).
* choice e: all kinds of problems with this one. if you don't see what's wrong with it, reply and we will elaborate.
D："when" must refer to a time period; "it took less than 35 years" isn't a time period - eliminate.
C："In less than the 35 years" is idiomatically incorrect. The proper idiom would be "In the less than 35 years" - and would change the meaning of the sentence - eliminate.
B："Their descendants" doesn't modify those who did the releasing, so "since releasing" is wrong - eliminate.
E：The whole thing sounds horrible (always a good reason to eliminate a choice), the tenses don't make any sense and "it took less" certainly doesn't go with "and then" - eliminate.
Do NOT use the past perfect in the "since" clause,
错选b，in less than是状语，since ……也是状语，不能有两个时间状语修饰，正确A选项 B had migrated less than 35 years after...
可A的after......和since......有什么区别吗？
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A great way to check whether A is correct is to have the two clauses switch places; begin with the main clause "their descendents, popular known as killer bees had migrated as far north as Southern Texas and finish with the subordinate clause "less than 35 years after the release of African honeybees outside Sao Paulo, Brazil". This gives us:
Their descendents, popularly known as killer bees, had migrated as far north as Southern Texas less than 35 years after the release of African honeybees outside Sao Paulo, Brazil.
This is indeed a correct sentence.
B has migrated less than 35 years after...
b since releasing,这样看起来好像 descendant是releasing这个动作的发出人，是很奇怪的
c 用了had been 两个had been 语态错乱
d when这里代表的意思是同时发生，不对，且如果it做形式主语，（后面跟todo 或that）那么那that去哪里了
e 核心句子意思就没有对，honeybees被释放然后后代怎么样怎么样一共花了不到35年 （核心句意：在bees被释放不到35年，后代完成迁移）
e的时态也是错乱的
如：Since 1990 the global economy has grown more than it did during the 10,000 years from the beginning of agriculture to 1950.表示从农业的起源到1990就是1000年时间，用did。
in the 25 years since jurgen schult's world record discus throw, very few throwers have even come close to equaling his mark.表示从JS打破世界纪录到现在，就是25年时间，用have。
笔记：
C主要是时态问题，不能两个had been 明显俩动作有时间先后
since加个过去时态，release是个过去动作
B releasing的主语是后裔了
A主要是没说现在是哪年
前半句，放生之后的35年，应该还是个过去的时间。所以从现在的角度，没划线的地方是had migrated，那前面放生那里，肯定是一般过去时。也能看出来C妥妥错了
C：since African honeybees had been released outside 接后面 their descendants, had migrated as far north as southern Texas.
暗示两个事情同时发生，显然不可能；先 released 再 migrated
A：descedants had migrated less than 35 years after the release.
B，since relasing是伴随，主语为descendants，错误
C，两个过去完成时，导致时态错乱，排除
D，when表同时发生，句子应是在释放后……迁移
E，句式有误
A correct
B. their descendants releasing African honeybees。。。不合逻辑，句意不对
Since 后面主句应该用现在完成时而不是过去完成时
B选项 since… 逻辑主语是their descendents 语义错误
补充：B选项since releasing里面出现了releasing 这个动词，它需要有主语，而划线部分后面句子的主语是“他们的后代”，这个主语不能发出releasing这个动作，杀B。
C选项里出现了一个跟别人都不一样的东西，就是35年之前加了the, 加the 的名词是特指的，这个名词要带了修饰语，就可以加the。比如说，in the short 35 years since, in the 35 years that surprised many scientists, 就应该有the, 而在C选项中这35年是没有加修饰语的，不应该加the。Since后面用的是过去完成时，释放发生在迁徙之前，迁徙已经是过去完成时，释放用过去完成时，时态上可以接受，但是语义上，since应该接的是一个单点的时间点，自从是自从一个时间点，而不是自从一个阶段性时间区间，而过去完成时的语义表达的是“已完成”，作为since的起点时间，是无法实现精准的。C选项可以放弃。
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A after the release是介词短语，作定语修饰35 years, 在释放后的不到35年，后代迁徙到北方
B In less than…是状语，修饰migrated, since releasing是状语，主语变成descendants, 不合逻辑
C In less than…是状语，since…是时间状语，修饰migrate, 迁徙这个动作是在不到35年后，迁徙这个动作是自从African honeybees被释放后，没有A好
D when是同时发生，逻辑上，应该先是release, 再是migrate, 再是35 years after release
E that African honeybees were released outside Sao Paulo, Brazil took less than the 35 years 被释放这件事花了不到35年，不合逻辑
it took 明显错误，it take sb xxx to do 句式，排除DE；
B. releasing African honeybees 发出动作的是 their descendants 不符合逻辑，排除；
剩下AC；
C选项（我也错选C了，哭）
since African honeybees had been released outside 接后面 their descendants, had migrated as far north as southern Texas.
暗示两个事情同时发生，显然不可能；先 released 再 migrated。。。
*补充https://www.beatthegmat.com/mba/2012/02/05/more-on-meaning-a-gmatprep-sentence-correction-problem 这个解析好棒！
类似的句子还有：Less than 10 years after her graduation from college, she had changed careers three times.
B. 主语是their descendants，变成了descendants released the honeybees，错误
C. 两个过去完成时，错误
"In less than the 35 years" is idiomatically incorrect. The proper idiom would be "In the less than 35 years" - and would change the meaning of the sentence - eliminate
B: releasing动名词是不对的，因为放出这个动作是一瞬间的，所以是有结束时间的。不应该用动名词
C：the 35 years语法错误
D：用了From应该把to也补出来；后面when的用法也有问题，when只能引导时间状语从句解释说明动作发生的时间，或者做定语解释说明前面的时间名词。可是在这里两者都不是。
E：it无指代，it在这里当不了形式主语
B. 主语是their descendants，变成了descendants released the honeybees，错误
C. 两个过去完成时，错误
D. when错误
E. and错误
B：since releasing，谁releasing？主语是谁？成分主语是descendants，但是逻辑不合理，哪有后代release祖先的？
C：（大家的观点，我觉得有道理，但不确定，请大佬指正）（1）since是现在完成时的标志词，而不是过去完成时；（2）In less than the 35 years是时间状语，since 句也是时间状语，一句话万万不能有两个时间状语（时间冲突了）
Less than 35 years是一个时间修饰语，而且是副词修饰，修饰的是the release。如果是in less than…就会变成定语。In和since感觉有点重复且奇怪。