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精英家教網 > 高中英語 > 題目詳情

【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閉后再關電腦,否則將有問題。or否則,要不然。

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