题目内容
—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
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题目内容
—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