—Who _____ it be that is knocking at the door?
—It ______be father, but I’m not sure.
A.can; may | B.may; can | C.may; must | D.need; should |
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—Who _____ it be that is knocking at the door?
—It ______be father, but I’m not sure.
A.can; may | B.may; can | C.may; must | D.need; should |