Before a problem can be solved, it must be obvious ______the problem itself is.
A．whatB．thatC．whichD．why
A

試題分析：考查主語從句：句意：在問題解決之前，問題本身是什么必須明確。it在句中做形式主語，真正的主語是what the problem itself is ，what在主語從句中做表語，選A。
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