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It isn’t an excuse for your failure ___________ you didn’t know the rules
A.ThatB.BecauseC.WhyD.How
A

试题分析:考查主语从句用法。本句中的it是形式主语。真正的主语是后面的that you didn’t know the rules.that在句中起引导和连接作用,不能省略,也没有什么含义。句意:你不知道规则这不是你失败的借口。故A正确。
点评:在复合句中做主语的从句叫做主语从句,它的位置与陈述句基本结构中的主语相同。引导主语从句的关联词有:连词:that, whether;连接代词:who, whom, whose, what, which;连接副词:when, where, why, how;复合词:whatever, whoever, whomever, when?蛳ever, wherever, whichever, however.解答这类题目,关键在于分析清楚句子结构。通过判断引导词在从句中所作的成分及意义,来选择正确的引导词。
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