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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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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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