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John thinks it won’t be long _________ h...

John thinks it won’t be long _________ he finishes the tough work.

A.when            B.after             C.since             D.before

 

D 【解析】 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 考点:考查连词
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