Before a problem can be solved，it must be obvious____the problem itself is.A．wha
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| Before a problem can be solved，it must be obvious____the problem itself is. |
答案
| A |
解析
| A解析：考查名词性从句。句意为“在一个问题被解决之前，这个问题本身是什么必须要明确。”分析句子成分后可知，在before引导的时间状语从句中，it为形式主语，真正的主语为“the problem itself is”，在主语从句中is后缺少表语，故用what引导。 |
举一反三
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