石林网络课堂第四课时，第52题

The rising of costs of data-processing operations at many financial institutions has created a growing opportunity for independent companies to provide these services more efficiently and at lower cost.

(A) The rising of costs
(B) Rising costs
(C) The rising cost
(D) Because the rising cost
(E) Because of rising costs

答案是C，我选了A。石林的理由是the rising of costs 中心词 rising 强调动作和过程，the rising cost 中心词 cost 强调状态和结果，因为状态和结果>动作和过程，所以选C

可我认为因为谓语是has created宾语是a growing opportunity，主语如果是cost的话，逻辑应该有问题啊，cost是不能造成增长的机会的，而the rising of costs则可以。

另外，我一直有一个疑问，到底什么情况下应该用costs什么情况下应该用cost？我看到大部分情况下都用的是costs。

先谢谢各位了

不好意思，我找到了回答这个问题的帖子了，大家可以看看

http://forum.chasedream.com/dispbbs.asp?BoardID=23&replyID=583042&id=66911&skin=0