There was a time ______ I thought my dad didn't know a thing about being a good father.
A：when
B：which
C：that
D：what
My bike is broken, so I have to go to school _________ my mother's.
炒熟的种子置于适宜的条件下也不能萌发，原因是（ ）
利率是表示（ ）的比值．
