题目内容
Don’t turn off the computer before closing all programs,________ you could have problems.????????????? ????????????? ????????????? ????????????? ????????????? ????????????? ????????????? ????????????? ????????????? ????????????? (2013·北京,22)
A.or? B.and
C.but? D.so
【答案】
【解析】 A
解析 考查连词用法。句意为:关闭所有程序后再关电脑,否则会有麻烦的。or否则,要不然,用于警告或忠告。
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