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【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】句意:你可以通過離開房間關燈來節(jié)約用電。A. turn up開大;B. turning on 打開; C. turn off 關上;D. turning off關上。依據(jù)句意,排除A,B;by為介詞,后跟動詞-ing形式。所以答案是D。

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