Before a problem can be solved, it must be obvious ______ the problem itself is.
　　A. what      B  that    C  which       D  why
A
本題考察的是名詞性從句中主語(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；
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