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    精英家教网 > 高中英语 > 题目详情
    Don’t turn off the computer before closing all programs，________ you could have problems.                                                          (2013·北京，22)
    A．orB．and
    C．butD．so
    　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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