【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(dòng)詞-ing形式。故答案為D。

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