--- Has Li Lei finished his work today?--- I have no idea but he it when I saw him this

问题补充：

--- 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

答案：

A. had done

B. would do

(答案→)C. was doing

D. did

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