he has done all that he could to help us improve our english 为什么只能用that不能用what?
题目
he has done all that he could to help us improve our english 为什么只能用that不能用what?
答案
all是代词,代词作先行词引导定语从句时,只能用that或者省略.
all that = what
不明白的再问哟,望及时采纳,多谢!
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