That is_____he said. A.all what B.all which C.all that D.all what 为什么选C啊

That is_____he said. A.all what B.all which C.all that D.all what 为什么选C啊

介宾短语啊，That is 后面需要的是名词或名词词组。
A不对，不需要加ALL，直接是what he said 就可以了
B不对，一看就知道，which是哪个
D不对，因为和A是一样的。
what he said 就是个名词短语了。

因为all是介词，all that就相当于what

what也行 把句子变为肯定句就是that is ___ he saidc 这里填all that，或者all （that），用what引导，这里是一个表语从句

ALL THAT=WHAT 所以答案是：that is what （all that）he said. all that (what) 引导宾语从句