问题补充：
The girl planned to have dance lessons at the training centre with her friend she would stay for an hour.
A. who
B. where
C. what
D. which
答案：
A. who
(答案→)B. where
C. what
D. which
解析：考查定语从句。句中先行词为the training centre，在定语从句中作地点状语，故用关系副词where，选B。
