请教大全 12-19？

jackie

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) superficial, as when the three major networks each

为什么是E压？
我觉得D对，是不是主谓不一至，each of the three major networks broadcast。。。
可是，E中as when the three major networks each broadcast。。
也是主谓不一致压？

lixiaoyang

each。。。。。 用单数
。。。。each用复数

jackie

thx!