大全SECTION 1 第10题

kathy72

10.    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
(E) gradual enough so that one cannot distinguish them

答案: A

D为什么不对? 是否系表结构用so..as to 优于 so  that. 还是说D中主要错在 unable to be done 的表达是错误的?

iselibra

a, so as to结构很清楚阿，逻辑主语和主句主语一致
d 首先，enough少用，其次怎么也得not enough吧

kathy72

不好意思, 我写作了, 是C为什么不对? D肯定不对了.