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—Who______itbethatisknockingatthedoor?—I—Who______itbethatisknockingatthedoor?—It______beFather,butI’mnotsure.A.can;mustB.can;mayC.must;canD.may;must
题目内容：
—Who______ it be that is knocking at the door?—I
—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优质解答
b
—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
优质解答
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