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