問題詳情:
—Look!The man at the gate ________ be our teacher. He is always standing there every morning.
—No,it ________ be him. He is having a meeting in the office now.
A. must;can't B. must;mustn't C. can't;can't D. can;can't
【回答】
A
知識點:情態動詞
題型:選擇題