885 SEC 1-13

13.   It is as difficult to prevent crimes against property as those that are against a person.

(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

不了解这题为什么B不对，

It is as difficult to prevent crimes against property as

(it is difficult to prevent)    those  against a person.

相同的不是可以省略??

在比较的时候到底什么可以省略，什么不能省啊，请牛人指教。

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