Before a problem can be solved, it must be obvious ______the problem itself is.
题型：不详难度：来源：
| Before a problem can be solved, it must be obvious ______the problem itself is. |
答案
| A |
解析
试题分析：考查主语从句：句意：在问题解决之前，问题本身是什么必须明确。it在句中做形式主语，真正的主语是what the problem itself is ，what在主语从句中做表语，选A。 |
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