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Mary decided not to work on the program at home because she didn’t want her parents to know what she __________.
A.has doneB.had doneC.was doingD.is doing
C

试题分析:考查时态。句意:Mary决定不在家里做那个项目,因为她不想她的父母知道她正在做的事情。根据句子的decided说明本句的基本时态是过去时,根据句意说明是过去的那段时间正在做的事情,故使用过去进行时。故C正确。
点评:时态题的考查要根据上下文的语境和语义的辨析,要抓住句子的关键词。
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