问题补充：
“Where is it?” “Where is ? I don know what do you mean?”
A. what
Bthat
C. where
D. so
答案：
(答案→)A. what
B. that
C. where
D. so
解析：许多同学认为“疑问词”只能出现在句首位置，对于选A认为不可理解。其实在某些特殊语境中，疑问词出现在句中甚至句末却是完全可能的,但这多半是因为有特殊的语境或使用的句式比较特殊。上面一题选what的原因是：上句问Where is it?(它在什么地),但听话人对此句中代词it指代什么东西并不清楚,所以他反问：Where is what?(什么在什么地方?)其实，这类用法在口语中经常使用。如：
Who said what to whom?谁对谁说了什么？
“Who took it?” “Who took what?”“谁把它拿走了?”“谁把什么拿走了?”
It was so dark I couldn tell who was who.当时一片漆黑，我分不清哪个是哪个。
“We are ready. Lets begin.” “Ready for what?”“我们准备好了，开始吧。”“准备干什么?”
“What are you going to do next fall?” “Next what?”“下一个秋季你打算要干什么?”“你说下一个什么?”
They look exactly the same, and I really don know which is which.它们看起来一模一样,我实在分不清哪个是哪个。
