一道有关宾语从句的选择题

问题描述:

一道有关宾语从句的选择题
Did you ask the teacher ____ the day before?
A. what was happended to her
B. what she had happened
C. what she happened
D. what had happended to her
请说明理由.

D.what had happended to her
happen的主语应该是something而不是somebody,因此B和C排除.something应该happens,而不是被动的is happened,因此选择D,排除A.