Question

Jeanne asked Mathilde ________．

1. A.
   that had happened
2. B.
   that had happened
3. C.
   what had been happened
4. D.
   what had happened to her

Answer 1

D
宾语从句中缺少主语，故应从C、D两项中选择，又因为happen为不及物动词，故排除C。