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

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

【答案】A

【解析】

句意:為了安全,你必須經(jīng)常小心用電。

考查情態(tài)動詞辨析。must必須,強調(diào)主觀意愿;can能,表能力或許可,否定式是can't;mustn't不能,表禁止。根據(jù)be careful with electricity for safety可知BCD三項不合句意,故選A。

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