Before the problem can be solved，it must be obvious ________ the problem itself
题型：不详难度：来源：
| Before the problem can be solved，it must be obvious ________ the problem itself is.(2011·湖南，31) |
答案
| A |
解析
| 句意：在解决问题之前必须弄清楚问题本身是什么。what引导主语从句，并在主语从句中充当表语。注：句中的it是形式主语。 |
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