【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】由句意“當(dāng)你離開時，請關(guān)燈以節(jié)省能源”可知，此處用動詞不定式作目的狀語，表示“為了……”。故選B。

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