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We hadn’t been out for long _________ she felt sick.
A.asB.whileC.afterD.before
D

试题分析:as表示原因;while当……时候;时间段+ before,过了多久就……;句意:我们还没出去多久她就生病了。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。
点评:本题难度适中。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
解析:D。句意:要准备好可能得数月时间。
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