—Where did you meet your middle school teacher?—It was in the supermarket I was doing so

问题补充：

—Where did you meet your middle school teacher?

—It was in the supermarket I was doing some shopping with my son.

A. that

B. where

C. when

D. which

答案：

A. that

(答案→)B. where

C. when

D. which

解析：试题分析：关系词的用法。此题很容易看成是强调结构而误选A。其实结合语境it是代指地方，用where来表示地点，引导定语从句。句意：——你在哪儿见到的你的初中老师啊？——在超市里，我和儿子在那儿购物呢。所以答案选B。