【经典实例】
Children rarely show any appreciation for ______ their parents do for them.
A. which B. how C. what D. why
【解析】选C。what引导的宾语从句用作介词for的宾语，同时what在宾语从句中用作动词do的宾语。
【类似例句】
With whom did you go? 你和谁一起去的?
To whom were you speaking? 你刚才在跟谁说话?
Since when have you became active? 你什么时候开始变得积极了?
For what purpose did you invite me to come here? 你们请我到这里来是为了什么目的?
What was her explanation for why she was late? 她对她的迟到有何解释?
二、省略后只保留“疑问词”
【经典实例】
Dr. Black comes from either Oxford or Cambridge, I can’t remember _____.
A. where B. there C. which D. that
【解析】选C。I can’t remember which为I can’t remember which city he comes from之省略。
【类似例句】
I have seen you before, but I can’t remember where. 我以前见过你，但是不记得在哪里了。
He would have preferred to put her idea aside together, if he had known how. 如果他已经知道情况，他宁愿把她一古脑儿抛到一边(from www.nmet168.com)。
Become a successful writer. This book shows you how. 要想成为一名成功的作家。这本书告诉你如何实现你的理想。
Something is the matter, but I don’t know what. 总有点不对劲，但我不知道是什么。
He has turned against his wife. He himself doesn’t know why. 他和妻子作对。他自己也不知为什么。
She’s got a down on me; I don’t know why. 她很讨厌我，我不知道为什么。
三、两个或多个“疑问词”连用
【经典实例】
Professor James will give us a lecture on the Western culture, but when and where ______ yet. (浙江卷)
A. hasn’t been decided B. haven’t decided
C. isn’t being decided D. aren’t decided
【解析】A。根据句意，此处应用被动语态，不用主动语态，故排除B;又因为when and where表示单数意义，故排除D;再根据句末的yet可知，最好用现在完成时，故选A最佳。
【类似例句】
Who or what is responsible for our failure? 我们失败的症结在哪里?
Where, when and how did she die? 她是在何地、何时及如何死的?
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