— When did you finish _____ your homework? 
— I finished it at 9:00 last night.

A. do
B. to do
C. did
D. doing
D
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科目：初中英語 來源：0110 期中題 題型：單選題

— When did you finish _____ your homework? 
— I finished it at 9:00 last night.
[     ]
A. do
B. to do
C. did
D. doing

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