--Who______ it be that is knocking at the door?

--It ______ be Father, but I’m not sure.

A. can; may B. can; must

C. must; can D. may; must

A

【解析】

試題分析：考查情態(tài)動(dòng)詞。句意：--敲門(mén)的人會(huì)是誰(shuí)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(wèn)句，must不用于疑問(wèn)句，排除C，故選A。

考點(diǎn)：考查情態(tài)動(dòng)詞

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