When did you first visit China?I think it _____in 1996,when my parents were teaching in Yunnan
When did you first visit China?I think it _____in 1996,when my parents were teaching in Yunnan
University.
A.must be B.should have been C.may be D.must have been
其余选项为什么不对,尤其是A?
University.
A.must be B.should have been C.may be D.must have been
其余选项为什么不对,尤其是A?
英语人气：333 ℃时间：2020-03-29 20:09:03
优质解答
表示对过去的推测,用情态动词+ have done的形式.所以排除A,C.而B表示的意思是本该做某事而没做,不符合题意,所以选择D.
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