【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】句意:當(dāng)你離開時(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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