制方涉及"益火之源，以消阴翳"原理的方剂是（）
A.四逆汤
B.理中汤
C.肾气丸
D.六味地黄丸
E.大补阴丸
参考答案：C
__________ five minutes_________ before the last train left, we arrived at the station.
A．There were; to go
B．With; to go
C．I was; left
D．It had; left
