— What were you up to when your parents came in?— I for a while and some reading.A. was

问题补充：

— What were you up to when your parents came in?

— I for a while and some reading.

A. was playing； was going to do

B. played； did

C. had played； was going to do

D. had played； did

答案：

A. was playing； was going to do

B. played； did

(答案→)C. had played； was going to do

D. had played； did

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