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【题目】The students _______ be careful during the exams.

A.mustB.mustn’tC.doesn’t have toD.has to

【答案】A

【解析】

句意:学生们考试时必须细心。

本题考查情态动词。A. must 必须,强调主观上;B.mustn't 在英语中不能用于表示推测,但是可以表示"禁止/不允许"之意;C. doesnt have to不必;D. has to必须, 不得不。强调客观上。根据介词短语during the exams.可知,此空是强调主观上的必须,此空应填must,故选A

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