某犬在采食中突然吞咽障碍，流涎，干呕，烦躁不安；X射线检查发现在胸腔入口前气管背侧有一不规则形状的高密度阴影，应实施（）

A.开胸术

B.喉囊切开术

C.食管切开术

D.气管切开术

E.喉室切开术

__________ 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