Before a problem can be solved, it must be obvious ________the problem itself is.(2011·湖南)

A．what B．that C．which D．why

 

A

【解析】A　[考查主語從句。從句中缺表語，排除B和D；又因題目沒有給出problem的范圍，故選A。句意：在解決問題之前，一定要弄清楚問題是什么。]

 

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