向NN求教:白勇P63,18

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,

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

答案选的是E，但是，我觉得应该选C。我的理由：未画线部分谓语动词broadcast用的复数形式，each应该用单数谓语动词。

请大NN一巴掌拍醒我，小女子在此谢过了！