— Has Sam finished his homework today? —
题型:选择题
问题:
— 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 |
— 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 |