问题
选择题
— Has Sam finished his homework today, Anne?
— I have no idea. But he ________ it this morning. [ ]
A .did
B. had done
C. was doing
D. had done
答案
答案：C
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— Has Sam finished his homework today, Anne?
— I have no idea. But he ________ it this morning. [ ]
A .did
B. had done
C. was doing
D. had done
答案：C