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    【题目】Don’t turn off the computer before closing all the programs, _____ you’ll have problems.

    A. but B. and C. so D. or

    【答案】D

    【解析】

    试题分析：考查连词。A. but 但是；B. and并且；C. so 因此；D. or 否则；句意：在关闭所有程序之前不要关电脑否则会出现问题。考查祈使句+or/and+ 陈述句，根据句意选or;

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