问题补充:
The girl went to have piano lessons at the training center with her sistershe would stay for an hour.
A. who
B. where
C. which
D. what
答案:
A. who
(答案→)B. where
C. which
D. what
解析:考查定语从句。定语从句Where she would stay for an hour修饰表示地点的先行词the training center。因为这个定语从句很完整,所以使用关系副词where。