He ______ be in the classroom because he was seen playing football on the play- ground.

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问题 He ______ be in the classroom because he was seen playing football on the play- ground.

选项 A、mustn’t
B、can’t
C、may not
D、isn’t able to

答案B

解析 “must +be”表示对目前状态的猜测，但只能用于肯定句。否定句和疑问句要用can。答案为B。

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