--- Has Li Lei finished his work today? --- I have no idea, but he ______ it when I saw hi

--- Has Li Lei finished his work today?

--- I have no idea, but he ______ it when I saw him this morning.

A. had done B. would do C. was doing D. did

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--- Has Li Lei finished his work today? --- I have no idea, but he ______ it when I saw hi

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