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-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
词义辨析。may not可能不;needn’t 不必;can’t不可能;mustn’t不可以。句意:听!玛丽在房间里弹钢琴吗?不。不可能是玛丽。她去香港了。所以选C。
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