Susan decided not to work on the program at home because she didn’t want her mother to know what she _____.
A．has doneB．had doneC．was doingD．is doing
C
考查時態(tài)：句意：Susan決定不在家里從事這個工作，因為她不想她的媽媽知道她做得事情。說明是過去正在做的事情。選C。
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