The girl arranged to have piano lessons at the training center with her sister ________ she would stay for an hour.

A．where

B．who

C．which

D．what

上衣包装要将衣服的背面朝上，在两肩之间按（）（等距离）的位置上对折过来，然后将袖子拽平。

A.1/2

B.1/3

C.1/4

D.相等处