—Where did you come across our chemistry teacher? —It was in the supermarket ______ I purchased mooncakes.
【正确答案】
C
【答案解析】 句意为“——你在哪里碰到了我们的化学老师? ——在我买月饼的超市里。”强调句的后半部分省略了that I came across our chemistry teacher. 被强调部分包含 一个定语从句，先行词是the supermarket，定语从句缺少的是地点状语，用where引导定语从句。故选C。