--Listen! Someone is knocking at the door.
-- ______ be Mary. She has just been to Beijing
A．She mustn’tB．It can’tC．It mustD．She may
C
此題充分體現(xiàn)了一題多考點的命題傾向，考查了情態(tài)動詞的選擇，代詞的選擇以及隱含語境has been to的用法。
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