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
其余選項為什么不對,尤其是A?
University.
A.must be B.should have been C.may be D.must have been
其余選項為什么不對,尤其是A?
英語人氣：710 ℃時間：2020-03-29 20:09:03
優(yōu)質(zhì)解答
表示對過去的推測,用情態(tài)動詞+ have done的形式.所以排除A,C.而B表示的意思是本該做某事而沒做,不符合題意,所以選擇D.
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