标题: PREP语法题时态问题求解 [打印本页] 作者: stellapan95 时间: 2016-4-7 12:39 标题: PREP语法题时态问题求解 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,
DIt took less than 35 years from the release of African honeybees outside Sao Paulo, Brazil, when
E It took less than the 35 years after the time that African honeybees were released outside Sao Paulo, Brazil, and then
A选项是正确答案，但搞不懂为什么后面要用过去完成时had migrated?
一般不都是before一个时间点,才用had done吗
这里说 35 years after the release of African honeybees,后面直接用一般过去时不就可以了吗？ 作者: elusive 时间: 2016-4-16 05:37
B：releasing容易产生歧义，因为后面有their descendant.所以是descendant在release
C：没有使用had done的标志，since是现在完成时态的标志，不是过去完成时态的标志
D：it必须是有指代的，是谁在took不知道
E和D一样错。还有后面的and也错了。