问题
选择题
16. —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
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16. —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