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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