问题补充:
Alice didn’t want her parents to know.
A. what has she done
B. what was she doing
C. how she had done
D. what she was doing
答案:
A. what has she done
B. what was she doing
C. how she had done
(答案→)D. what she was doing
解析:句意:Alice不想让她的父母知道她在干什么。know后面的宾语从句用what引导,表示正在做某事。