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    All lights______after the students left the classroom


    1. A.
      went down
    2. B.
      goes off
    3. C.
      goes down
    4. D.
      went off
    D
    试题分析：go down表示停止，被接受，沉下，被打败的意思，而go off表示离开，消失，变差，熄火的意思，所有的灯都熄灭，所以将go down和went down，排除，又根据时间状语after the students left the classroom.可知答案为一般过去时，故选D
    考点：动词词组和动词的时态。
    点评：本题考查的是动词词组的区别和识记
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