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【题目】When having a fire drill, we _____run downstairs.

A.needn’tB.mustn’tC.can’tD.may not

【答案】A

【解析】

句意:进行消防演习时,我们不必跑下楼。

考查情态动词。A. needn’t不必;B. mustn’t不准、禁止;C. can’t不可能;D. may not也许不是。根据句意,进行消防演习时,我们不必跑下楼,CD选项表推测,不符合句意,可排除。B选项语气强硬,是“禁止做某事”的意思,与句意不符,故应选A

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