| A. | turn off | B. | are turned off | C. | are turned on |
分析 --当你离开房间的时候务必关上所有的灯.
--好的,我会的.
解答 答案:B.根据turn off表示"关上",turn on表示"打开",根据句意可知,应是"离开时关上灯",应用turn off.根据题干可知,主语all the lights是动作turn off的承受者,和动词构成被动的关系,应该用被动语态,表示"灯被关".被动语态的结构是"be+过去分词";故选B.
点评 主要考查被动语态,当句子的主语是动作的承受者时,应该用被动语态,本题考查的是一般现在时态的被动语态.一定要注意:一般现在时态的被动语态的构成:am/is/are+及物动词的过去分词,以及动词过去分词的形式.
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