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

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题目分析：
本题难度较大，尤其是选项(A)和选项(D)之间，可能有些难以抉择。


选项分析：

选项A：Correct. 本选项在语法和逻辑上均是正确的。

选项B：需将不定式短语to make burrowing difficult和to cause tunnels to collapse改为结果状语从句，这点考查了不定式和从句的区别。用之于本题，主句讲的是：
花岗岩土壤并没有那么硬，也没有那么软（hard enough/soft enough）
在主句所讲的状态出现时，显然，让“掘土更难”和“让隧道垮塌”这两件事均不会开始发生，也不会让这两件事从开始变结束。

选项C：不定式错误同选项(B)。另外，enough和so是重复的。

选项D：不定式错误同选项(B)。

选项E：本选项的错误很容易看出来。too…to…句型是大家在初中就学过的，至少应该写成这个句型，以避免语法错误（当然，改成too…to…句型也不正确，依然存在不定式的问题）。

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