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【题目】You always be careful with electricity for safety.

A. mustB. canC. mustn'tD. can't

【答案】A

【解析】

句意:为了安全,你必须经常小心用电。

考查情态动词辨析。must必须,强调主观意愿;can能,表能力或许可,否定式是can'tmustn't不能,表禁止。根据be careful with electricity for safety可知BCD三项不合句意,故选A

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