Who______ it be that is knocking at the door?
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
—It ______ be Father, but I’m not sure.
A. can; must B. can; may C. must; can D. may; must
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