问题
选择题
| Susan decided not to work on the program at home because she didn't want her mother to know what she _____. |
| A. has done B. had done C. was doing D. is doing |
答案
答案：C
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| Susan decided not to work on the program at home because she didn't want her mother to know what she _____. |
| A. has done B. had done C. was doing D. is doing |
答案：C