题目内容
【题目】Don't turn off the computer before closing all programs, ________ you could have problems.
A. or B. and
C. but D. so
【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。
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题目内容
【题目】Don't turn off the computer before closing all programs, ________ you could have problems.
A. or B. and
C. but D. so
【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。