问题
选择题
——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
答案：C
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。