–Sometimeisknockingatthedoor.Who

問題詳情：

–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

【回答】

A

知識點：情態動詞

題型：選擇題