they will be thankful for （ ）you have done A what B that C which D 选什么 为什么they will be thankful for （ ）you have doneA what B that C which D选什么 为什么为什么不选that呢 为什么人们总是说 不选that 是因为that

Question

they will be thankful for （ ）you have done A what B that C which D 选什么 为什么
they will be thankful for （ ）you have done
A what B that C which D
选什么 为什么
为什么不选that呢 为什么人们总是说 不选that 是因为that 在宾语从句中不做任何成分 可是有些宾语从句中也会出现that 而且that 也会充当一定的成分 这是为什么呢

Answer 1

选择A
They will be thankful for 【what 】you have done.
他们会感激你所做的.
what~在句中引导介词for的宾语从句.
而what在宾语从句部分中作宾语,you have done what.
根据句意“你做的什么”,就是what you have done.
而且,宾语从句中that不做成分,只是起到连接的作用.如果要连接词在句中起主宾表等,要用what.
例如：I can tell you that l like English.that 不做成分
that在定语从句是可以做成分的：I like the book that is on the table.这里that作在从句中做主语.