题目信息
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
参考答案及共享解析
共享解析来源为网络权威资源、GMAT高分考生等； 如有疑问，欢迎在评论区提问与讨论
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已选答案：
正确答案：
A:so hard that it makes burrowing difficult or so soft that it could cause
考点：平行
B错。as是多余的。
C错。不平行
D错。as...as...结构必须有比较的对象。
E不平行
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题目来源
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