I walked slowly through the market ,where people _all kinds of fruit and vegetables.i studied the prices carefully and bought what I need.A.sell B.were selling C.had sold D.have sold 答案是选B.为什么不选A

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I walked slowly through the market ,where people _all kinds of fruit and vegetables.i studied the prices carefully and bought what I need.A.sell B.were selling C.had sold D.have sold 答案是选B.为什么不选A
I walked slowly through the market ,where people _all kinds of fruit and vegetables.i studied the prices carefully and bought what I need.
A.sell B.were selling C.had sold D.have sold
答案是选B.为什么不选A

I walked slowly through the market ,where people _all kinds of fruit and vegetables.i studied the prices carefully and bought what I need.A.sell B.were selling C.had sold D.have sold 答案是选B.为什么不选A
因为整句用的都是过去的时态,定语从句不可能出现现在时态,所以也应用过去的某种时态,故用过去进行时,表示过去某个时间正在进行的动作,此句中表示I walked slowly through the market 的时候,所以选B,C项为过去完成时,表示在过去的过去,所以不符合句意.

看清时态。句子的整体时态是一般过去式，所以不能选A,A是一般现在时

这是时态的问题，当时你走进市场，周围的人正在卖水果，所以要用过去进行时，不用A
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