Don’t turn off the computer before closing all programs，________ you could have problems.                                                          (2013·北京，22)
A．orB．a(chǎn)nd
C．butD．so
　A
解析　考查連詞用法。句意為：關(guān)閉所有程序后再關(guān)電腦，否則會(huì)有麻煩的。or否則，要不然，用于警告或忠告。
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