--Who______ it be that is knocking at the door?
--It ______ be Father, but I’m not sure.

A．can; mayB．can; must
C．must; canD．may; must

A

解析試題分析：考查情態(tài)動(dòng)詞。句意：--敲門的人會(huì)是誰呢？--可能是爸爸，但我也不確定。must表示肯定的推測(cè)，意為“一定”，根據(jù)“I’m not sure”可排除B、D；can表示推測(cè)時(shí)意為“可能”，用于否定句或疑問句，must不用于疑問句，排除C，故選A。
考點(diǎn)：考查情態(tài)動(dòng)詞

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