摘要：-Listen!Someone is knocking at the door. - be Mary.She has just been to Beijing. A.She mustn’t B.It can’t C.It must D.She may 答案 C
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--Listen! Someone is knocking at the door.
-- ______ be Mary. She has just been to Beijing
A. She mustn’t B. It can’t C. It must D. She may
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