--Who is the person talking with you just now?
-- Well, if you ______ know, his name is David.
A．mayB．canC．mustD．shall
C
考查情態(tài)動詞：A. may 可以，B. can能夠，  C. must 必須，偏要D. shall將會，句意是;--剛剛和你說話的是誰？--如果你偏要知道，是大衛(wèi)。選C。
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