题目内容


—Who______ it be that is knocking at the door?  
—It ______ be Father, but I’m not sure.
A．can; mustB．can; mayC．must; can D．may; must
B
考查情态动词。Can可能；may也许。句意：——可能是谁在敲门呢？——也许是父亲，但我不确定。
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