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__________ it is true that a student’s m...

__________ it is true that a student’s most important goal is to do well in his or her studies, it doesn’t need to be the only goal.

A.While            B.As               C.When            D.Before

 

A 【解析】 试题分析:考查连词,A. as当…时候B. until直到…C. while当…时候D. when当…时候,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,when所引导的从句,其谓语动词即可是持续动词,也可是短暂动词;谓语动词动作发生的时间可以与主句谓语动词的动作是同时、或之前、之后;while句中的谓语动词是持续动词,不用短暂动词,位于动作发生的时间通常与主句谓语动词动作发生时间是同时;as侧重指从句的动作与主句的动作同时进行,谓语动词可以是持续性动词,也可以是短暂性动词,所以选A 考点:考查连词
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