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.Very loud noises ______ make people ill. So we ______ make great noise

A. must ; mustn ' t B. need ; needn ' t

C. can ; mustn ' t D. must ; can ' t

【解析】

試題分析：句意：非常大聲的音樂可能會使人生病。所以我們千萬發出那么大的噪音。must,can(could),may(maight) 可以表示猜測，must 表示肯定猜測，用于肯定句，肯定……，一定……；can’t,表示否定猜測，肯定不……，另外can(could),may(maight)，表示可能性猜測，可能……。mustn’t,表示禁止，根據句意可知是可能性的猜測，故選C.

考點：考查情態動詞的用法。

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