--- Professor Brown, I enjoyed your lecture at HK University last year. --- Thanks. But it over two years ago, if I can remember rightly. A. must have been B. can be C. may be D. might be 查看更多

 

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.(2010·湖南祁阳四中高三上第一次月考)      31. ─ Professor Brown, I enjoyed your lecture at HK University last year.

─Thanks. But it ______ over two years ago, if I can remember rightly.

A. must have been    B. can be         

C. may be          D. might be

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