问题补充：
---Where did you our chemistry teacher?
---It was in the supermarket I purchased moon cakes.
A. come to, where
B. come across, that
C. come across, where
D. come to, that
答案：
A. come to, where
B. come across, that
(答案→)C. come across, where
D. come to, that
解析：考查动词短语和连词。句意：你是在哪儿遇见的我们的化学老师？是在我买月饼的超市里。
come across 遇见，come to共计，所以排除Ａ和Ｄ，第二个空容易选Ｃ，但不对，理由是问句和答语不一致，如果是that ,句意为：在超市里我买了月饼，和问句不一致，填where，构成的是定语从句，句意：在我买月饼的店里，所以Ｃ正确。
