核心问题
问】We have solved the problem who was at fault. 请问 the problem 与 who 从句存在着什么样的语法关系？一个名词可以直接与 wh-从句连用吗？
词典解答
应当了解英语用法的一种趋势: 在 wh-从句以及 wh-不定式之前的介词常常被省略掉。在上面的 who 从句之前省略了介词 of(参见 idea )。再如：
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... had little idea of what they wanted to do. ……对于他们想要做什么，一无所知。
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I'm not sure (about) what to do. 我不能确定要干什么。
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They haven't yet decided (on) which flight they will take. 他们还没有决定乘哪一个航班。
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Nobody could decide (as to) what to do. 没有人能决定该做什么。
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I wasn't altogether clear (about) what we had to do. 我一点儿也不明确我们必须做什么。