"Our Math teacher must be in his office now." "No, he ______ be there. I saw him

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问题 "Our Math teacher must be in his office now." "No, he ______ be there. I saw him in the library a minute ago."

选项 A、can’t
B、couldn’t
C、mustn’t
D、wouldn’t

答案 A

解析这里情态动词can表示可能性，推测数学老师现在不可能在办公室。而不是过去的事情。另外， mustn’t则表示不准，不允许的意思。

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