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我是小菜鸟,求教各位NN:
以下这4句话有没有语法错误?
1. it is as difficult to prevent crimes against property as against a person.
2. it is as difficult to prevent crimes against property as those against a person.
3. it is as difficult to prevent crimes against property as to prevent crimes against a person.
4. it is as difficult to prevent crimes against property as it is to prevent cimes against a person.
多谢
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