there be 句行中什么时候用that什么时候用but呢 the manager is satisfied with all that you have done.that为什么不能改为what

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there be 句行中什么时候用that什么时候用but呢
the manager is satisfied with all that you have done.that为什么不能改为what

1.引导定语从句的关系代词只有that/which/who/whom/whose,没有what
2.当先行词为不定代词时,关系代词只能用that
the manager is satisfied with (all that)=what you have done.