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【题目】School students________ smoke because it is against the school rules.

A.needn'tB.couldn'tC.mustn'tD.won't

【答案】C

【解析】

句意:学生禁止吸烟,因为吸烟违反了学校规章制度。

考查情态动词。needn’t不必;couldn’t不可能;mustn’t禁止;won't将不会,用于将来时。根据 it is against the school rules,可知学生吸烟违反了学校规章制度,所以是明令禁止的。mustn't禁止。故选C

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