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(wèn)題之前必須弄清楚問(wèn)題本身是什么。what引導(dǎo)主語(yǔ)從句，并在主語(yǔ)從句中充當(dāng)表語(yǔ)。注：句中的it是形式主語(yǔ)。
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