Before a problem can be solved, it must be obvious ________the problem itself is.(2011·湖南)
A．whatB．thatC．whichD．why
A
A　[考查主語(yǔ)從句。從句中缺表語(yǔ)，排除B和D；又因題目沒(méi)有給出problem的范圍，故選A。句意：在解決問(wèn)題之前，一定要弄清楚問(wèn)題是什么。]
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