大全214？

liaijun_2001

1.                  Climatic shifts are so gradual as to be indistinguishable at first from ordinary fluctuations in the weather.

(A) so gradual as to be indistinguishable

(B) so gradual they can be indistinguishable

(C) so gradual that they are unable to be distinguished

(D) gradual enough not to be distinguishable（A）

(E) gradual enough so that one cannot distinguish them

C

请问C错在哪里？

liaijun_2001

我顶

三脚猫

结构上是没错，但没有A简洁。关于so as to和so  that的区别，楼主可参看一下置顶贴中的语法点讨论，以有明确的讨论。