扫描二维码，直接登录
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
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
C: in the 35 years 如果表示一段时间，应该加past, last等等；since替代了after改变句子原意，release这个动作没持续到migrated开始
用完成时：“have/had done…since did”，没见过have/had done…since have/had been done 的结构出现过.
选项A正确，未划线部分出现了现在完成时，意味着划线部分中必须有一个过去的时间点，此选项中35 years after the release of African honeybees 即为这个时间点。因此逻辑上时间线为： release honeybees—> migrate —> 35 years after the release。
选项B since是现在完成时的标志，不可以和had migrated同时出现；their descendants成了releasing的主语，不符合逻辑语义；In less than 35 years……做时间状语修饰had migrated显然不符合逻辑。
选项C since是现在完成时的标志，不可以和had migrated同时出现In less than 35 years……做时间状语修饰had migrated不符合逻辑
选项D it 作形式主语的正确句式是：It took some time to do something
选项E 同上
sequence of events 决定了动词的时态。
Right: The band U2 WAS just one of many new groups on the rock music scene in the early 1980s, but less than ten years later, U2 HAD fully ECLIPSED its early rivals in the pantheon of popular music.
且完成时时态错误
B: In 35 years 表示将来，改变了句意；since releasing 是介词+分词结构，分词逻辑主语不对；
C: in the 35 years 如果表示一段时间，应该加past, last等等；since替代了after改变句子原意，release这个动作没持续到migrated开始
用完成时：“have/had done…since did”，没见过have/had done…since have/had been done 的结构出现过.
+1登录 或 注册 后可以参加讨论
Less than 35 years after the release, correct.
In less than 35 years, correct.
In less than 35 years after the release, wrong.