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–Someone is knocking at the door. Who ______ it be?
--It         be Victor. He has gone to London yesterday.
A．can; mustn’tB． can ; can’tC．will; mustD．may; mightn’t
B

試題分析：句意：有人正在敲門。它可能是誰？不可能是維克多，昨天她已經去了倫敦。must,can(could),may(maight) 可以表示猜測，must 表示肯定猜測，用于肯定句，肯定……，一定……；can’t,表示否定猜測，肯定不……，另外can(could),may(maight)，表示可能性猜測，可能……。根據句意，可知第一次問，不知是誰敲門，所以把握比較小，后文的猜測因為知道他去了倫敦，所以是否定猜測的把握比較大。根據句意，故選B
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