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题目
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Don’t turn off the computer before closing all programs,________ you could have problems.                                                          (2013·北京,22)
A.orB.and
C.butD.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。
核心考点
试题【Don’t turn off the computer before closing all programs,________ you could have 】;主要考察你对数词等知识点的理解。[详细]
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