—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
考查情態(tài)動詞。Can可能；may也許。句意：——可能是誰在敲門呢？——也許是父親，但我不確定。
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