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【题目】She has been on the flight for twelve hours. She ______ be very tired.

A.can'tB.mustC.canD.mustn't

【答案】B

【解析】

句意:她已经坐了12个小时的飞机。她一定非常累。

本题考查情态动词。can't不可能,表示有把握的推测;must一定,表示有把握的推测;can能;mustn’t禁止。根据She has been on the flight for twelve hours.可知,她坐了12个小时的飞机,一定感到累了,这是有把握的推测,用must,故选B

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