单项选择题

While mother ___ some housework, I _ a car model for Jack.(1.0) A.
did, made B.
was doing, was making C.
was doing, made D.
did, was making

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While mother _______ some housework, I _____ a car model for Jack.(1.0) A. did, made B. was doing, was making C. was doing, made D. did, was making