GWD-23-Q13

41. GWD-23-Q13
            

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.

1. so hard that it makes burrowing difficult or so soft that it could cause

2. hard enough to make burrowing difficult or soft enough as to cause

3. so hard as to make burrowing difficult or soft enough so it causes

4. as hard as to make burrowing difficult or as soft as to cause（as…as可用在否定句吗？）

5. too hard, making burrowing difficult, nor too soft, so as to cause

这道题不选D是因为AS...AS  不能用在否定句吗？  可怎么觉得A中makes 和 could cause放在一起很怪？

as..as 肯定句

so..as 带有明显否定词的否定句中，就是必须有not

makes ，could casuse为啥奇怪呢