(A) those that are against a
(B) those against a
(C) it is against a
(D) preventing those against a（E）
(E) it is to prevent those against a
最简洁的是:against a person还是to prevent crimes against a person?
否则就应该像E中把省略都补全么?
我觉得是要像E一样补出的。如果不补出it is, 会造成比较对象的不明确和不平行。而it在这里是形式宾语，所以还要补出to do不定式短语.
请NN斧正。
我觉得是要像E一样补出的。如果不补出it is, 会造成比较对象的不明确和不平行。而it在这里是形式宾语，所以还要补出to do不定式短语.
请NN斧正。
有道理！
OG中的解释是这样的
This sentence compares two actions, preventing crimes against property and preventing crimes against a person, in terms of difficulty. These actions should be described in grammatically parallel structures. Consequently, choices A, B, and D are faulty because they fail to parallel the first clause, which has it as a subject and is as a verb. Choice C contains it is but lacks to prevent those, words needed to complete the required clause and identify the other action in the comparison. Choice E is best: all of the elements necessary to describe the second action are presented in a form that is both idiomatic and grammatically parallel to the description of the first action. The question is moderately difficult.
as引导的句子都有这个要求嘛：补出助动词，而且要补全！
觉得用
to prevent those against a person也可以？
请NN指正。
考古！
首先，我同意四楼的观点。我对答案还是有的不理解
我把it用不定式带回
To prevent crimes against property is as difficult as to prevent those against a person.
这样结构清晰没有问题。
答案
It is as difficult to prevent crimes against property as it is to prevent those against a person.
我不理解的是第一个is是比较结构前的系动词，第二个is是什么成分，两个有平行关系吗？
如我举的回带结构和正确答案相比，平白多了一个is，对此我很疑惑。希望nn能给点提示。
为什么b不对啊？those只能指代crimes，没什么歧义嘛。
是因为as。。。as结构要求补全吗？
比方说A as B as C，那么C到底补全到什么程度，补B，还是AB都要补？
能不能这样理解
as~~as结构中的后一个as是连词，表比较
as做连词时要接完整的主谓结构，所以必须有“it is”，之后再接平行的结构~
开始选了B，觉得平行部分都可以省略，后来意识到as做连词后面要把结构写完整
这么想对么？
在比较结构中， 如果主语和谓语完全一致， 是可以全部省略的． 在这道题中，关键在于分析句子的结构， 因为它使用了形式主语， 那么it就是主语，is 就是谓语， 但后面的as difficult to prevent crimes against property as .... 是一个介宾结构． 如果要省略的话，介宾结构必须保留的， 所以应该是as to prevent those against a person. 但是没有这个选项， 所以选Ｅ．
为什么不能选C呢？？？
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