Before the problem can be solved，it must be obvious ________ the problem itself is.(2011·湖南，31)
A．whatB．thatC．whichD．why
A
句意：在解決問題之前必須弄清楚問題本身是什么。what引導主語從句，并在主語從句中充當表語。注：句中的it是形式主語。
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