单选题 In the wine shops, the wine jars were in place, and on one counter could be seen a stain ______a customer had thrown down his glass and fled.

A、 where
B、 that
C、 which
D、 how

【正确答案】 A

【答案解析】题目的后半句是个倒装句，正常语序为 a stain could be seen on one counter where a customer had thrown down his glass and fled．这里where是关系副词，在定语从句中充当地点，在意义上相当于介词短语，而that，which 是没有这种功能的。how表示方式、手段、程度，用在句中显然也是错误的。