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It is obvious to the students______they should get well prepared for their future.
A,as      b,which    C,whether      D,that
D

试题分析:通过分析句子结构,可知句子的真正主语是后面的主语从句,it是形式主语,且引导词在主语从句中没有作任何成分,且没有任何实际意义,故用that。
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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