OG13

13.State officials report that soaring rates of liability insurance have risen to force cutbacks in the opera­tions of everything from local governments and school districts to day-care centers and recreational facilities.

(A)rates of liability insurance have risen to force

(B)rates of liability insurance are a force for

(C)rates for liability insurance are forcing

(D)rises in liability insurance rates are forcing

(E)liability insurance rates have risen to force

C中的are forcing如果改成have forced或者have been forcing，对不对？

能不能仔细说说三者的区别，我觉得意思差得不多，谢啦！！

我认为题目中主要是想要表达soaring rates和forcing这两个动作是同时进行的，所以即使有have been这样的情况，也不应该作为答案。

State officials report that soaring rates for liability insurance are forcing cutbacks in the opera­tions of everything from local governments and school districts to day-care centers and recreational facilities.

【OG】correctly uses the progressive verb form are forcing to indicate an ongoing situation.

soaring rates高涨的保险率是正在发生的现象，are forcing cutbacks是现象造成的结果，如果用 have fored或have been forcing，就表示正在出现的现象造成过去的结果，在时态的次序和逻辑上都有问题！

现在发生的现象只能造成现在或未来的结果！

但report只能报告已经发现的现象，所以这里只能用一种时态，进行时！

真理越辩越明啊,感谢诸位master!

不是很同意，查过语法字典，对于现在完成时的解释是