【題目】—Don’t leave your computer_____ if you don’t use it. Electricity is valuable.

— Sorry, I won’t.

A. on B. out C. off

【答案】A

【解析】

試題分析：句意：—如果你不使用它別讓你的電腦開著。電是寶貴的�！獙Σ黄�，我不會了。leave…on讓……開著。據(jù)if you don’t use it.，故選A。

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