—Look! The man at the gate ______ be our headmaster. He is always standing there every morning...
—Look!Themanatthegate______beourheadmaster.Heisalwaysstandingthereeverymorning.—No,it...
—Look! The man at the gate ______ be our headmaster. He is always standing there every morning.—No, it ______be him. He is holding a meeting in the office now. A.must, can’t B.must, mustn’t C.can’t, can’t D.can’t, mustn’t
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