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what与that引导名词性从句时有何区别? 请看题：
I think __________ he needs is more practice.
Yes. __________ he needs more practice is clear.
A. what, What B. that, That C. what, That D. that, What
此题应选 C。其余三项均可能被误选。what 和 that 都可以引导名词性从句，但有区别。如：
1. what 引导名词从句时，它在从句中要充当句子成分(主语、宾语等)，而 that 引导名词从句时，它在从句中不能充当句子成分。
2. what 引导名词从句时，它有词义(表示：什么;所的[东西]);而 that 引导名词从句时，它没有词义。
请做以下试题，注意区别 what 和 that。如：
1. ________ you said is different from the thing ________he told us.
A. What, what B. That, that
C. What, that D. That, what
2. I think ________ he said is true.(www.yygrammar.com)
But dont forget the fact ________he is a cheat.
A. what, what B. that, that
C. what, that D. that, what
3. ________ surprised us most is ________he spoke English so well.
A. What, what B. That, that
C. What, that D. That, what
答案：1. C 2. C 3. C