- 难题Susandecidednottoworkontheprog
- Susan decid not to work on the program at home because she didn't want her parents to know what she _______
A. was doing B.had done
- A. was doing
what she was doing - 正在做什么
what she had done - 已经做了什么
susan 的工作还没有做, 但是他不象在家做, 因为她不象让父母知道他在做什么. 所以用A. was doing