Susan 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
考查動(dòng)詞的時(shí)態(tài)。因?yàn)橹髡Z(yǔ)的工作當(dāng)時(shí)尚未完成，又處于過(guò)去的時(shí)間背景當(dāng)中，所以采用過(guò)去進(jìn)行時(shí)態(tài)。
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