问题补充：
--I called you yesterday evening, but there was no answer.
--Oh, I’m sorry I in the shopping mall.
A. shop
B. shopped
C. was shopping
D. have shopped
答案：
A. shop
B. shopped
(答案→)C. was shopping
D. have shopped
解析：此句为过去进行时，所以用be+doing
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