Don't turn off the computer before closing all programs, you could have problems.A. or B. andC.

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【题目】Don't turn off the computer before closing all programs, ________ you could have problems.

A. or B. and

C. but D. so

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【答案】A

【解析】

试题分析：考查并列句的连词。警示要所有程序都关闭后再关电脑，否则将有问题。or否则，要不然。