.（2010·湖南祁阳四中高三上第一次月考）31.─ProfessorBrownIenjoyedyourlectureatHKUniversitylastyear.─Thanks.ButitovertwoyearsagoifIcanrememberrightly.A.musthavebeenB.ca
.（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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