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——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

试题分析:考查情态动词和强调句型。本题是强调句型的变化句式:It 情态动词+被强调成分+that/who其它成分;本题第一空是一个强调句型的特殊疑问句,第二空是强调句型的省略句。Can可能;must一定;may也许;句意:—可能是谁在敲门呢?—也许是父亲吧,但是我不敢确定。根据后面的I’m not sure说明这里是不确定的事情,故第二空使用may表示也许。故B正确。
点评:情态动词就是表示说话者对事情的一种看法,也就是一种语气。情态动词的用法一直是命题者常设置的考点和重点,平时要加强记忆。值的注意的是,中学阶段的情态动词常考额有13个,can-could may-might should-ought to had better will-would   need  have to .考生应注意对这13个情态动词的用法多总结,多运用。
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