–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(mén)。它可能是誰(shuí)？不可能是維克多，昨天她已經(jīng)去了倫敦。must,can(could),may(maight) 可以表示猜測(cè)，must 表示肯定猜測(cè)，用于肯定句，肯定……，一定……；can’t,表示否定猜測(cè)，肯定不……，另外can(could),may(maight)，表示可能性猜測(cè)，可能……。根據(jù)句意，可知第一次問(wèn)，不知是誰(shuí)敲門(mén)，所以把握比較小，后文的猜測(cè)因?yàn)橹浪チ藗惗�，所以是否定猜測(cè)的把握比較大。根據(jù)句意，故選B
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