It was at this shop I came across one of my old friends.
A. which
B. that
C. where
D. in which
网友回答
A. which
(答案→)B. that
C. where
D. in which
解析：考查强调句型。强调的基本结构：It is/was 被强调成分that/who其它成分。把it is/was…that/who去掉，句子仍然成立。本题强调的是at this shop这个地点状语。句意：就是在这家商店里，我遇见了我的一个老朋友。故B正确。