【題目】 —Who______ it be that is knocking at the door?

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

A. can; must B. can; may

C. must; can D. may; must

【答案】B

【解析】

試題分析：考查強(qiáng)調(diào)句型和情態(tài)動詞。強(qiáng)調(diào)句型的基本結(jié)構(gòu)為It is/was被強(qiáng)調(diào)成分that/who其它成分；其最大的特點(diǎn)就是去掉it is/was…that/who…句子仍然成立。要注意強(qiáng)調(diào)句型能強(qiáng)調(diào)除謂語動詞以為的所有的句子成分。在考查的時候，經(jīng)常會把強(qiáng)調(diào)句型和定語從句結(jié)合在一起考查，要注意分析句子的成分。有時候會表示強(qiáng)調(diào)句型中的is/was換成“情態(tài)動詞+be的形式”；句意：—敲門的會是誰呢？—也許是爸爸，我也不確定。第一空用can表示推測；第二空后面有may說明和不確定，故使用may也許。Must表示一定，必須；故B正確

考點(diǎn) : 考查強(qiáng)調(diào)句型和情態(tài)動詞

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