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Whenyouleave,pleaseturnoffthelights

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問題詳情：

Whenyouleave,pleaseturnoffthelights

When you leave, please turn off the lights _________ energy.

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

【回答】

B 由句意“當你離開時，請關燈以節省能源”可知，此處用動詞不定式作目的狀語，表示“為了……”。故選B。

知識點：非謂語動詞

題型：選擇題

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