【題目】When you leave , please turn off the lights energy.

A. save B. to save C. saving D. saved

【答案】B

【解析】

試題分析：句意：當(dāng)你離開(kāi)時(shí)請(qǐng)關(guān)燈以節(jié)約能源。動(dòng)詞不定式表示目的，結(jié)合句意，故選B。

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