-Listen! Is Mary playing the piano in the room?
--No. It ________ be Mary. She has gone to Hong Kong.
A．may notB．needn’tC．can’tD．mustn’t
C
詞義辨析。may not可能不；needn’t 不必；can’t不可能；mustn’t不可以。句意：聽！瑪麗在房間里彈鋼琴嗎？不。不可能是瑪麗。她去香港了。所以選C。
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