——Who       it be that is knocking at the door?
——It       be Father, but I’m not sure.
A.can; mustB.can; mayC.must; canD.may; must
B

試題分析:考查情態(tài)動詞和強調(diào)句型。本題是強調(diào)句型的變化句式:It 情態(tài)動詞+被強調(diào)成分+that/who其它成分;本題第一空是一個強調(diào)句型的特殊疑問句,第二空是強調(diào)句型的省略句。Can可能;must一定;may也許;句意:—可能是誰在敲門呢?—也許是父親吧,但是我不敢確定。根據(jù)后面的I’m not sure說明這里是不確定的事情,故第二空使用may表示也許。故B正確。
點評:情態(tài)動詞就是表示說話者對事情的一種看法,也就是一種語氣。情態(tài)動詞的用法一直是命題者常設(shè)置的考點和重點,平時要加強記憶。值的注意的是,中學(xué)階段的情態(tài)動詞?碱~有13個,can-could may-might should-ought to had better will-would   need  have to .考生應(yīng)注意對這13個情態(tài)動詞的用法多總結(jié),多運用。
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