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(shí)態(tài)呼應(yīng)上考慮，A和D均錯(cuò);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(gè)時(shí)刻正在進(jìn)行的動(dòng)作用過去進(jìn)行時(shí);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(jìn)行時(shí)。
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