【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(jīng)坐了12個(gè)小時(shí)的飛機(jī)。她一定非常累。

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

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