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
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B解析试题分析：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。
考点：本题考查时态