【題目】You can save electricity by _______ the lights when you leave a room.

A. turn up B. turning on

C. turn off D. turning off

【答案】D

【解析】

試題分析：句意：你可以通過離開房間關(guān)燈來節(jié)約用電。A. turn up開大；B. turning on 打開； C. turn off 關(guān)上；D. turning off關(guān)上。依據(jù)句意，排除A,B；by為介詞，后跟動詞-ing形式。故答案為D。

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