My parents used they had to get a new car for my brother.A. whatB. whichC. all whatD. 不填

问题补充：

My parents used they had to get a new car for my brother.

A. what

B. which

C. all what

D. 不填

答案：

(答案→)A. what

B. which

C. all what

D. 不填

解析：宾语从句。引导词what在句中充担宾语