Susan decided not to work on the program at home because she didn’t want her mother to know what she .
A. has done
B. had done
C. was doing
D. is doing
网友回答
A. has done
B. had done
(答案→)C. was doing
D. is doing
解析：考查时态：句意：Susan决定不在家里从事这个工作，因为她不想她的妈妈知道她做得事情。说明是过去正在做的事情。选C。