-----the end of last term ,everybody here in the school.I think has taken at least five English tests.
问题描述：
-----the end of last term ,everybody here in the school.I think has taken at least five English tests.
A.by B.since C.from D.at答案选B 为什么?
答
如果A,那么has taken变had taken,表示截止上学期末.之前的之前,过去完成时
如果D,那么has taken变成took,一般过去时,是时间点
如果C,那么has taken变成will take,从上学期末开始.表示将来时
所以B,自从上学期末到（现在）为止.所以满足since的现在完成时
可以消息