so, such的用法

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（A）

(E) gradual enough
so that one cannot distinguish them

24.   Several
years ago the diet industry introduced a variety of appetite suppressants, but
some of these drugs caused stomach disorders severe enough to have them banned
by the Food and Drug Administration.

(A) stomach
disorders severe enough to have them

(B) stomach
disorders that were severe enough so they were

(C) stomach
disorders of such severity so as to be

(D) such severe
stomach disorders that they were（D）

(E) such severe
stomach disorders as to be

这两题都是考查了　　so 和SUCH　的　　用法　　而且答案形式都是一样的　　so/such .....as to be 　　　而没有选so\such....that从句的结构　　

是不是前一个结构要优于后面那个？？？

正确答案是A和E　　两个答案的结构都是一样的　　so/such .... as to...

第二题D为什么不对？？这是关键

24答案是D

我记错了　24是D　　那有没有such....as to 的结构　

10中　C　so ..that 从句为什么不对？？

so gradual that they are unable to be distinguished这个结构错了

be able to be done永远错,主被动搞一起了