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    All lights______after the students left the classroom.

    A．went downB．goes offC．goes downD．went off

    D

    解析试题分析：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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