请教一语法题。

piranha

The early railroads were __ the existing arteries of transportation:roads, turnpikes,canals,and other waterways.

A.those short lines connected

B.short lines that connected

C.connected by short lines

D.short connecting lines

答案：B。

请教A为什么不对，我认为把connected the existing arteries of transportation

理解为分词定语修饰lines也可以啊。

piranha

非常感谢！！！。

jojof5460

agree!!!!

crossmoon

按照你的理解，如果把A改成：short lines connected by (/with) 就对了。

或者改成short lines connecting 也勉强说得过去。

过去分词做定语，是“被。。。。”的意思，需要介词。