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名词性从句中what,which与that的区别
例句：What he said sounds reasonable. 他说的听起来有道理。
What he said是一个由what引导的名词性从句，作句子的主语, what是复合关系代词，相当于the thing(s) that。因此，在名词性从句中可以用the thing(s) that取代的，只能用what。
①名词性从句中what与that的区别：that在名词性从句中不作句子成分，what必须作句子成分。
②名词性从句中what与which的区别：指代前文已经提到过的对象或范围时，用which，否则用what。
练习：
①This is _____ he wanted.
A. which B. that C. what D. this
②This is the thing _____ he wanted.
A. this B. that C. what D. who
③She is no longer _____ she used to be.
A. which B. that C. this D. what
④She is no longer the person _____ she used to be.
A. that B. which C. what D. this
⑤_____ our team has won the game has been proved.
A. which B. This C. That D. What
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