【題目】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】

試題分析：考查并列句的連詞。警示要所有程序都關(guān)閉后再關(guān)電腦，否則將有問(wèn)題。or否則，要不然。

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