Constant practice has erased my accent to a point people think I’m a native speaker.
A. that
B. which
C. in which
D. at which
网友回答
A. that
B. which
C. in which
(答案→)D. at which
解析：考查定语从句：句意：经常练习使我的口语到了一个阶段人们认为我是当地人。这是定语从句，先行词是a point，定语从句缺少状语，排除AB选项，因为point是和介词at搭配的，所以用at which引导定语从句，选D。