GMAT语法有很多零散的知识点，这些知识点要求我们系统的掌握，从而了解GMAT语法的正确规则，今天我们就来说一下GMAT语法enough知识点考察。
enough的固定搭配
enough for sb. 对某人来说足够了
enough to do something 足够做某事
错误搭配：(X) enough + ”that / so as to / so to / so that”
相关链接：enough to, so/such…that…, so/such…as to三者都表示结果,区别在于:enough to表示主观满足,在标准书面语中很少使用; so/such...that不用考虑逻辑主语问题; so/such...as to逻辑主语等于句子主语,即句子主语可以执行as to后面动词所表达的作用。
The city has proposed a number of water treatment and conservation projects the cost of which raises water bills high enough so that even environmentalists are beginning to raise alarms.
A. the cost of which raises water bills high enough so that
B. at a cost raising water bills so high that
C. at a cost which raises water bills high enough so
D. whose cost will raise water bills so high that
E. whose cost will raise water bills high enough so that.
翻译：
这个城市已经提议了一系列的水治理和储存项目，这些项目的花费将会把水费上升到一个很高的程度以至于连一些环境保护者都开始提出警告。
句式：
The city has proposed a.....whose cost will raise water bills so high that......
思路：
enough一般不用于表述“太…以至于”的情况，所以ACE可以排除;at a cost of doing固定搭配，而不是at a cost doing。
选项：
A. The cost of名词形式冗长，不如动词精简有效;enough一般不用于表述“太…以至于”的情况，另外enough不与so that搭配;
B. at a cost raising应该改为at a cost of raising;另外，另外介词短语就近修饰名词，cost raising会变成修饰water bills而不是projects，改变了文章意思
C. which只有在前面有介词或者逗号的情况下才能使用，cost不符合条件;enough一般不用于表示“太…以至于”的情况，另外enough so意思表达也不正确;
D. 正确;
E. Enough错误同A。
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
翻译：
研究人员假设花岗岩土地是沙漠龟理想的筑巢材料，因为它不至于太坚硬以至于很难被挖凿，或者太软使得地道塌陷。
句式：
Researchers hypothesize that granitic soil is the ideal for DT because it is so hard that or so soft that
思路：
简要阅读题目可以发现文章大致有两个平行结构，一个太硬一个太软，因为平行需要前后结构一致，所以BCE都可以排除，D因为前面有not，所以应该把as…as改成so…as。
选项：
A. 正确;
B. Enough一般不用于表示太…以至于的意思，另外enough as to固定搭配错误，而且前面enough to和后面enough as to结构不一致;
C. 前面是so…as to，后面是enough so…平行结构不一致;
D. "not as hard as"后面应该加名词而不是一个动作;而且是用作比较，和原句语义已经违背;
E "making burrowing difficult" 和 "to cause tunnels to collapse"并不平行。
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