宾语从句中的what和thatThe old woman was shocked by what had happened to her daughter.这句话中what可不可以用that代为什么

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宾语从句中的what和that
The old woman was shocked by what had happened to her daughter.
这句话中what可不可以用that代
为什么

首先:
what happened 发生了什么事
并没有that hanpened 说法
其次:
很简单,如果能去掉这个引导词而不影响句子意思的,就用that;否则就用其他的.因为在宾语从句中that是没有实际意义的,而what,which,where等要保留他们的意义.
what=the thing that
that前需要有一个先行名词.
what 前不能有 ,但是可以有介词
如,the reason lies in what he has said.
可以说成i should do the thing that i can