求助啊~！！prep语法

shunliqumeiguo

8.(24773-!-item-!-188;#058&001691)

Ozone, a special form of oxygen that screens out harmful ultraviolet rays, reaches high concentrations twelve miles above Earth, where it has long appeared that it was immune from human influence; we have now realized, though, that emissions of industrial chlorofluorocarbons deplete the ozone layer.

(A) has long appeared that it was immune from

(B) has long appeared to have been immune from

(C) has long appeared as being immune to

(D) had long appeared immune to

(E) had long appeared that it was immune to

答案为D

我就想问下红色部分的IT到底只带什么？？？
我是这样理解的 IT是形式主语，那主语就在IT之后。可是就是搞不清去到底指代什么。
——————————————————————————————————————————————————————

14.(25197-!-item-!-188;#058&002294)

Three out of every four automobile owners in the United States also own a bicycle.

(A) Three out of every four automobile owners in the United States also own a bicycle.

(B) Out of every four, three automobile owners in the United States also owns a bicycle.

(C) Bicycles are owned by three out of every four owners of automobiles in the United States.

(D) In the United States, three out of every four automobile owners owns bicycles.

(E) Out of every four owners of automobiles in the United States, bicycles are also owned by three.

答案A

我选了 D，为什么不对的呢？求指点！！！

shunliqumeiguo

帮帮忙啊！！！万分感激！！！