Before a problem can be solved，it must be obvious____the problem itself is.
A．whatB．thatC．whichD．why
A
A解析：考查名詞性從句。句意為“在一個問題被解決之前，這個問題本身是什么必須要明確�！狈治鼍渥映煞趾罂芍赽efore引導(dǎo)的時間狀語從句中，it為形式主語，真正的主語為“the problem itself is”，在主語從句中is后缺少表語，故用what引導(dǎo)。
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