Before a problem can be solved, it must be obvious the problem itself is. A. what B that C which D why 题目和参考答案——青夏教育精英家教网——

题目内容

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

A

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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