–Sometime is knocking at the door. Who ______ it be?
--It ______ be Tom. He is still in the school.
A. can; can’t B. can; mustn’t C. might; could D. might; may
–Sometime is knocking at the door. Who ______ it be?
--It ______ be Tom. He is still in the school.
A. can; can’t B. can; mustn’t C. might; could D. might; may
A