问题
单项选择题
I walked slowly through the market, where people（）all kinds of fruits and vegetables. I studied the prices carefully and bought what I needed.
A. sell
B. were selling
C. had sold
D. have sold
答案
参考答案：B
解析：
根据句意：我慢慢走过市场，那里人们正在卖(were selling)各种水果和蔬菜……