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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。
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