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
解析：play 在came in 之前已完成，而do some reading 的动作则即将开始。
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