（2014年安徽省合肥市高三第三次教學質(zhì)量檢測）31. What the whole nation cares about most at present is ______ the rescue teams could find the missing plane.

A. thatB. ifC. whyD. whether

 

D

【解析】句義：現(xiàn)在全國關(guān)心的是救援隊伍是否可以找到失蹤的飛機。If不能引導(dǎo)表語從句，that在表語從句中沒有任何實際含義，也不能省略；why的意思和上下文不相符。故D正確。

【試題延伸】

表語從句就是用一個句子作為表語。說明主語是什么或者怎么樣，由名詞、形容詞或相當于名詞或形容詞的詞或短語充當，和連系動詞一起構(gòu)成謂語。解答這類題目，關(guān)鍵在于分析清楚句子結(jié)構(gòu)。通過判斷引導(dǎo)詞在從句中所作的成分及意義，來選擇正確的引導(dǎo)詞。連接表語從句的從屬連詞主要有that, if, whether，和疑問詞（what how where when ...)。that引導(dǎo)表示陳述句的表語從句，if和whether，whether...or not引導(dǎo)表示“是否”，引導(dǎo)一般疑問句。連接代詞主要有who,whom,whose,what,whoever,whomever,whosever,whatever,whichever等。連接代詞一般指疑問，但what, whatever除了指疑問外，也可以指陳述。連接副詞主要有when, where, why, how, whenever, wherever, however等.

 

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