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【題目】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:她已經坐了12個小時的飛機。她一定非常累。

本題考查情態(tài)動詞。can't不可能,表示有把握的推測;must一定,表示有把握的推測;can能;mustn’t禁止。根據She has been on the flight for twelve hours.可知,她坐了12個小時的飛機,一定感到累了,這是有把握的推測,用must,故選B。

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