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    -- When did you finish your homework? -- I finished it at 9:00 last night. A. do B. to do C. did D. doing 【查看更多】

     

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    — 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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