(2014年安徽省合肥市高三第三次教学质量检测)31. What the whole nation cares about most at present is the rescue teams could find the missing plane.A. thatB. ifC. whyD. whether 题目和参考答案——青夏教育精英家教网—

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（2014年安徽省合肥市高三第三次教学质量检测）31. What the whole nation cares about most at present is ______ the rescue teams could find the missing plane.

A. thatB. ifC. whyD. whether

【解析】句义：现在全国关心的是救援队伍是否可以找到失踪的飞机。If不能引导表语从句，that在表语从句中没有任何实际含义，也不能省略；why的意思和上下文不相符。故D正确。

【试题延伸】

表语从句就是用一个句子作为表语。说明主语是什么或者怎么样，由名词、形容词或相当于名词或形容词的词或短语充当，和连系动词一起构成谓语。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。连接表语从句的从属连词主要有that, if, whether，和疑问词（what how where when ...)。that引导表示陈述句的表语从句，if和whether，whether...or not引导表示“是否”，引导一般疑问句。连接代词主要有who,whom,whose,what,whoever,whomever,whosever,whatever,whichever等。连接代词一般指疑问，但what, whatever除了指疑问外，也可以指陈述。连接副词主要有when, where, why, how, whenever, wherever, however等.

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