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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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错选B
BC中in less than 和since都是时间状语，不能有两个时间状语修饰
B since加ING的逻辑主语是后代，不合理
C中since后面是过去完成时，主句也是过去完成时，不合理
D it无指代
E 语意错误。原句有先后顺序，E搞成了并列
A vs B
since releasing伴随状语--- 需要逻辑主语
here are two examples to illustrate.
it is december 2007; the world record in the discus throw has stood since 1986.
it was july 1991; the world record in the long jump had stood since 1968. --> but it was broken later that year
when we use the present perfect, we don't usually have a second event, because the second 'event' is the present. on the other hand, when the time described in a sentence is actually in the past (because of the way the sentence is narrated), then whatever would normally occur in the present perfect must be translated into the past perfect.
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.
Less than 35 years可以看成一个副词，修饰after，翻译为在释放African honeybees后的至少35年，所以划线部分作状语，a语法句意ok
句首状语与句子有合理的逻辑关系，语法正确，所以原句没有问题。
选项B和C：since用法使用错误，since是现在完成时的时间标志词，不能与过去完成时搭配。
选项D和E: it做形式主语，没有指代；并且E选项after the time that 表达复杂。
A中less than 35 years做副词，修饰后面状语。B中相当于有两个介词短语即两个状语
A.less than ……是修饰after the release……的
BC.in less than……则是状语 since ……也是状语 不能有两个时间状语修饰
看到过去完成时就迫不及待的想去找标志语句了，
B，since releasing可以构成伴随状语，使descendants成为release的逻辑主语
C，the+数字+名词表示那些就是全部数量，如：the three witnesses to a crime意思是总共只有3名罪犯。the 35 years since表示从……到现在就是35年，它对应的是现在式而不是过去式。
考点为时态；一前一后发生，后者是完成时，那么前者应该是过去时。B中since releasing的主语是他们的后代，逻辑语义错误；C的when表明二者同时发生，错误； The 35 years 表明距离现在35年，而距离现在多少年是未知的，题目只说明这两个事件之间的距离是35年。排除CE
错因：以为代词不能指代介宾短语中的宾语，排除了A
B：暗含releasing的主语是 honeybees' descendants，错误
C：since后面用had done错误
DE：It作形式主语出现无指代错误
牛逼了，上来就把正确答案排除了。。。大姐你这是要自己出题自己考么？
说了是错因了 而且做题时候有排除正确答案的情况不奇怪吧
不好意思，没看到前面错因二字
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BC:Since是现在完成时的标志词，不能与过去完成时搭配。
DE：It作形式主语出现无指代错误
A：less否定词前置表强调，“after不到35年”，真正的介词短语是after，引入了一个时间状语，其时间逻辑是 release honeybees—> migrate —> 35 years after the release
B：in才是真正的时间状语引导词，since是对35 years的修饰，综合起来是说在releasing后的不到35年里，应该用一般过去时；同时，releasing无逻辑主语
C：in错误同B；同时less than+数字是一个泛指的数字，这个数字不能是特指，应该要不是“in the 35 years since..”要不是“in less than 35 years since”
D：it无指代，且连词when逻辑错误 E：it无指代，the特指错误，语句不通
the time interval "three years" is modified by a clause beginning with a subordinate conjunction ("after" in (A) and "since" in (C)). Because it's modified in this way, it does not need a preposition.
choice b, since releasing African honeybees中，releasing的主语变成了their descendants. incorrect
choice d, when时间状语强调‘同时发生’，意思就变成‘释放鸟之后的35年’ 和‘后代移民到了得克萨斯南部’同时发生
choice e, 变成了并列句，也割裂了句子之间的联系。
the time interval "three years" is modified by a clause beginning with a subordinate conjunction ("after" in (A) and "since" in (C)). Because it's modified in this way, it does not need a preposition.
错误选C，认为主语 没有第一时间出现，但their descendants,没化线，其实是否加in都是时间状语。A更简洁。
A，Less than 35 years after the release of African honeybees，核心词是after……作时间状语，35years修饰after多久
如：3 years after my leaving Nanjing，the city had changed a lot.
less than35作副词修饰after
b：releasing 主语变后面
c：in...状语 ， since...状语 。两状语 意思不对了。