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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.
(A) Less than 35 years after the release of African honeybees outside Sao Paulo, Brazil,
(B) In less than 35 years since releasing African honeybees outside Sao Paulo, Brazil,
(C) In less than the 35 years since African honeybees had been released outside Sao Paulo, Brazil,
(D) It took less than 35 years from the release of African honeybees outside Sao Paulo, Brazil, when
(E) It took less than 35 years after the time that African honeybees were released outside Sao Paulo, Brazil, and then
正确答案是(A).提问：在A的情况下，为什么主句里需要用过去完成时had migrated，而不用migrated？以及，D和E中it took less than 35 years的表达，为什么错误呢？谢谢！
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发表于 2018-1-10 03:25:43
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