Did you go to Shanghai by( )plane?No,Iwent there on( )train.A./;a B./;/

问题描述:

Did you go to Shanghai by( )plane?No,Iwent there on( )train.
A./;a B./;/

by plane, on the train.
答案是:/;the。

A by后直接加交通工具 不加任何介词

A