Containertransport的中文含义是（）
A.集装运输
B.集装箱运输
C.中转运输
D.运输
参考答案：B
It ___ to be raining when we went to see him off at a railway station.
A．happened
B．had happened
C．took place
D．took
网络服务和协议的概念以及其相互关系
