问题
选择题
| — Has Sam finished his homework today? — I have no idea. He _____ it this morning. |
| A. did B. has done C. was doing D. had done |
答案
答案：C
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| — Has Sam finished his homework today? — I have no idea. He _____ it this morning. |
| A. did B. has done C. was doing D. had done |
答案：C