问题
选择题
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
答案
答案：C
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。