—We can a bus to Shanghai. Bus tickets(票) are cheap.— I want to go there train. It has a l

问题补充：

—We can a bus to Shanghai. Bus tickets(票) are cheap.

— I want to go there train. It has a lot of fun.

A. take; on

B. by; by

C. take; take

D. take; by

答案：

A. take; on

B. by; by

C. take; take

(答案→)D. take; by

解析：在表示交通方式时，take后接交通工具表示乘……去……，on表示在某种交通工具上，一般要加冠词或者形容词修饰；by后直接接交通工具。句意：我们可以乘公交车去上海。公交车票便宜。——我想乘火车去。那很有趣。结合语境可知选D。