[求助]大全８３,搜索过了,但没满意的答案

83 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

对大全关于选项E的解释，我不懂，

原文为＂as做连词when引导状语从句，意思可以合起来理解：好象＂

即使as when做＂好象＂解，也说不通，就好象选项中的if 一样，这里应该是要＂当＂的意思吧？？还望各位NN指点

p.s．

坚决支持中文问问题，答问题！！！

谢,我懂了

不好意思,另外請問一點

e中的each在此有何作用?

在句中為劃線部分是用broadcast 此plural verb,那麼為何前面會有個each呢???

each後面不是都接singular verb嗎??

At an orientation meeting, the travelers were told that a visa, a landing card, and evidence of inoculation against typhoid fever would be needed by each of them.

A.   a visa, a landing card, and evidence of inoculation against typhoid fever would be needed by each of them

D. they would each need a visa, a landing card, and evidence of inoculation against typhoid fever

借轉youpaio所發之帖...

但是在此題中each 與其後的singular noun對應的很好...

讓我跟這題搞不清了...

到底這兩題本質上的差異在哪呢??