Before a problem can be solved, it must be obvious the problem itself is.　　A. what B that

发布时间：2020-08-16 17:54:55

Before a problem can be solved, it must be obvious      the problem itself is.
　　A. what      B  that    C  which       D  why

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解析：本题考察的是名词性从句中主语从句。从句中缺表语，排除B和D；又因题目没有给出problem的范围，故选A；
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