—Who______ it be that is knocking at the door?—I

—Who______ it be that is knocking at the door?—I

题目
—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
答案
b
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