Question

My parents used __ they had to get a new car for

My parents used __ they had to get a new car for My parents used __ they had to get a new car for me .
A which B that C what D all what

Answer 1

C。
My parents used _what_ they had to get a new car for me .我父母倾尽所有为我买了车。

追问

all what 为什么不行

追答

all what犯了语法错误。all是先行词,表示倾尽所有，what 要和后面的they had组成一个定语从句。但what不是定语从句的连接词，在有all的情况下，定语从句的连接词只能用that.所以all what犯了两个错误，all which都是错误，只能用all that，或只用all

Answer 2

选C
what they had 作used 的宾语，。what 有作they had 的宾语

Answer 3

D
all what they had 他们所有的（钱或积蓄）

Answer 4

what 引导名词性从句 做宾语