请教大全987第19题 ?

19.   Although it claims to delve into political issues, television can be superficial such as when each of the three major networks broadcast exactly the same statement from a political candidate.

(A) superficial such as when each of the three major networks

(B) superficial, as can sometimes occur if all of the three major networks

(C) superficial if the three major networks all

(D) superficial whenever each of the three major networks（E）

(E) superficial, as when the three major networks each

请NN给讲讲为什么选E?

我搜出的大全19为什么不是这道题呢?

A，such as是表举例，后跟名词不跟从句

B，as can sometimes occur if all of the three major networks   can的主语是什么？

C，if 表条件从句，改变逻辑意思，而且形式应该是x will happen, if y happens

D，whenever each of the three major networks与后面的broadcast 主谓不一致

个人看法！