【题目】—Where did you come across our Chinese teacher?
—It was in the supermarket ___________ I purchased mooncakes.
A.that
B.where
C.which
D.when

【答案】B
【解析】考查定语从句。句意：——你在哪里遇到我们的语文老师的？——这是在我购置月饼的超市。the supermarket是先行词，在后面的定语从句中做地点状语。可知答案为B。其实此句是一个强调句型，that部分省略。故选B。