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。
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。
agree!!!!
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