问题
选择题
—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
答案：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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