——Where did you come across our chemistry teacher ?------ It was in the supermarket I pur

问题补充：

——Where did you come across our chemistry teacher ?

------ It was in the supermarket I purchased mooncakes.

that B. which C. where D. when

答案：

解析：主要测试强调句型的省略用法。被强调部分属于一个定语从句，只不过强调句的后半部分：that I came across our chemistry teacher省略了。此类试题属于高考常考题型。