16. —Who____ it be that is knocking at t
题型:选择题
问题:
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
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