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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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b,c 的since都是开放时间的标志，句子的谓语用的是过去完成时态，要求时间是封闭的，所以since的选项干掉
d, it的真正主语是后面的from the release,与原句句意不一致
e,it是形式主语，真正的主语应该是后面的their descendants had migrated,句意就变成他们的后代迁移到北至Texas的南方花了至少35年，这明显跟原句的句意不一致
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