GWD一题，求教！！

self346959851

Researchers hypothesize that granitic soil is the ideal construction material for the desert tortoise because it is not so hard that it makes burrowing difficult or so soft that it could cause tunnels to collapse.

A.    so hard that it makes burrowing difficult or so soft that it could cause
B.    hard enough to make burrowing difficult or soft enough as to cause
C.    so hard as to make burrowing difficult or soft enough so it causes
D.    as hard as to make burrowing difficult or as soft as to cause
E.    too hard, making burrowing difficult, nor too soft, so as to cause

答案是A
我选了D，请问D错在哪？我觉得很对称啊！！

Kb24

D: not as....as to so sth.....用法不对

self346959851

if it's too soft, the tunnels will collapse, that's why this material cannot be too soft.
C: soft enough so it causes collapse: opposite meaning. We say 'My GMAT score is high enough to get me admitted by Stanford'. We don't say: 'My GMAT score is low enough to get my ass kicked by Standford adcom'

Besides, C is not so //:
so hard as to make .... or soft enough so it causes...: 不平行啊

-- by 会员 Kb24 (2011/4/25 17:44:56)

不好意思啊~打错了。
我选的是D` 请问D错在哪？

Kb24

if it's too soft, the tunnels will collapse, that's why this material cannot be too soft.
C: soft enough so it causes collapse: opposite meaning. We say 'My GMAT score is high enough to get me admitted by Stanford'. We don't say: 'My GMAT score is low enough to get my ass kicked by Standford adcom'

Besides, C is not so //:
so hard as to make .... or soft enough so it causes...: 不平行啊