Susan decided not to work on the program at home because she didn’t want her parents to know what she_____.
A．has done
B．had done
C．was doing
D．is doing
C
答案C。從時態(tài)呼應上考慮，A和D均錯;Susan不想讓其父母知道她眼下正在干什么，便背著父母偷偷干。
　　過去某個時刻正在進行的動作用過去進行時;在口語中，說話者所說內(nèi)容是非一定目的、隨意的，亦常用過去進行時。
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