（1）The idea that computers can recognize human voices surprises many people.
我知道句(1)中的 that 从句是同位语从句。但我不知道句(2)中的 how 从句是什么从句。
除了 that 引导同位语从句之外, wh-词(包括 how) 也可以引导同位语从句, 有时用介词 of(或 as to) 来表明这种同位关系:
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We have solved the problem (of) who was at fault. 我们已解决了谁有过错的问题。
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... had little idea of what they wanted to do ……不大知道他们想干什么
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have no idea(of) how, what etc... 不知道如何,什么等等……
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You can have no idea(of) how anxious we have been. 你可能不知道我们是多么焦急。
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She had no idea at all as to what I ought to do with Mr. Ernest. 她一点儿也不知道我应当同恩斯特先生做什么。
但是,从惯用法上说,在上述句子里使用 of 或 as to 的情况是比较少见的:
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You have no idea how worried we were. 你不知道我们是多么焦虑。
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I have no idea where she's gone. 我不知道她去哪儿啦。
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You have no idea how embarrassed I feel. 你不知道我感到多么为难。
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She had no idea why she thought of him suddenly. 她不明白她为什么突然想到了他。
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I have no idea when he will be back. 我不知道他什么时候回来。
请做下面的英语试题：
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They have no idea at all ____. A. where he has gone B. where did he go C. which place has he gone D. where has he gone(全国高考)
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I have no idea ____ he will come back. A. where B. when C. what D. that
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I have no idea what ____ while I was asleep. A. happened B. had happened C. was happened D. has happened