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37.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 , OG的解释是: This sentence correctly uses the idiomatic construction so x that y where y is a subordinate clause that explains or describes x: So debilitating that it has become. ...It clearly refers to schistosomiasis, which is correctly modified by the adjective debilitating.
我的问题是: (1) it is so debilitating that it has become an economic 中的第一个it 到底指代的是什么? 是schistosomiasis 还是that后边的内容? OG解释“so debilitating that it has become. it clearly refer to schistosomiasis. ”是不是说第二个it 是指代schistosomiasis,而第一个it 是指代that后边的内容? (2)可是答案又说 it clearly refer to schistosomiasis, which is correlty modified by the adjective debilitating, 那还是the schistosomiasis is debilitating吧? 那岂不是第一个it是指代schistosomiasis? 可是如果第一个it就是指代the schistosomiasis, 第二个it也是指代the schistosomiasis, 那么C选项为什么不对呢? OG的解释是“The construction so x as to y is not a correct idiom” 完全没懂。。。
我彻底迷惑了,请各位各位大侠指导。。。
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