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
网友回答
A. sell
(答案→)B. were selling
C. had sold
D. have sold
解析：句意：当我慢慢的走过市场时，那儿的人们正在卖各种各样的蔬菜和水果。sell一般现在时表示经常性，习惯性的动作。had sold过去完成时，表示过去之过去。have sold现在完成时，表示过去发生的动作对现在造成的影响。