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    精英家教网 > 高中英语 > 题目详情
    John thinks it won’t be long _________ he finishes the tough work.
    A．whenB．afterC．sinceD．before
    D

    试题分析：考查连词，since表示自从…；when当……时候；after在…之后；时间段+ before，过了多久就……；before主要引导时间状语从句，意为“先于”“…之后才”“(不多久)就…”。当主句是将来时时，从句谓语动词须用现在时；当主句是一般过去时或过去完成时时，从句常用过去时。before引导的时间状语从句不能用于否定式。所以选D
    点评：判断从句中用哪个连词，需用记住连词的用法，在句中的作用，连词也是高考的热点，需要考生平时多练习。
    即学即练：It may be a matter of months _____ it's ready.
    A. as      B. while      C. after         D. before
    选D
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