问题
选择题
| — Have you watched the nine o'clock news? — No. I ______ my homework at home all the morning. |
A. had done B. have done C. did D. have been doing |
答案
答案：D
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| — Have you watched the nine o'clock news? — No. I ______ my homework at home all the morning. |
A. had done B. have done C. did D. have been doing |
答案：D