136. Although schistosomiasis is not often fatal, (it is so debilitating that it has become an economic) drain on many developing countries.
(A) it is so debilitating that it has become an economic
(B) it is of such debilitation, it has become an economical
(C) so debilitating is it as to become an economic
(D) such is its debilitation, it becomes an economical
(E) there is so much debilitation that it has become an economical
答案是a没有问题，只是我不明白为什么这里要用完成时。做大全时，时态我一直晕晕的，最后才敢排出这个语法点。
超级感谢！
136. Although schistosomiasis is not often fatal, (it is so debilitating that it has become an economic) drain on many developing countries.
(A) it is so debilitating that it has become an economic
(B) it is of such debilitation, it has become an economical
(C) so debilitating is it as to become an economic
(D) such is its debilitation, it becomes an economical
(E) there is so much debilitation that it has become an economical
答案是a没有问题，只是我不明白为什么这里要用完成时。做大全时，时态我一直晕晕的，最后才敢排出这个语法点。
超级感谢！
作GMAT语法，不用这样问为什么
只要能够排除错误就好了
因为每个题目里面的选项都是相对的
很多都没有绝对的“为什么”
而且，个人建议不要去试图修改GMAT的选项
一般来说，弄明白“为什么错”是可能的
弄明白“为什么对”对于解题意义不大
谢谢，pumpkin，我想多了
http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=3287&replyID=&skin=1
MM看看这个吧《1stzhang的语法三板斧！ 》
经典中的经典
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