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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.
- so hard that it makes burrowing difficult or so soft that it could cause
- hard enough to make burrowing difficult or soft enough as to cause
- so hard as to make burrowing difficult or soft enough so it causes
- as hard as to make burrowing difficult or as soft as to cause
- too hard, making burrowing difficult, nor too soft, so as to cause
D选项看似工整，但是as...as（先不管否定句当中最好使用not so...as...的结构）是在比较中使用的结构，D选项的比较对象至少是不可比的granitic soil is系表结构和不定式之间的比较to make burrowing，如果此题出现在比较题目当中的话，我想应该大部分人不会选择D选项了吧。  | 
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发表于 2009-4-2 10:28:00
