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
考查動詞的時態(tài)。因為主語的工作當(dāng)時尚未完成，又處于過去的時間背景當(dāng)中，所以采用過去進行時態(tài)。
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