[求助]白勇语法第三章18题

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) 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) superfical, as when the three major networks each

问题：

as when什么意思？开头的it指什么？谢谢大家指教！

as when 意思是就像……的时候。举例的意思。

it 指的是television

谢谢你，挺明白的，那it claims to怎么翻,总觉得这句子翻得挺变扭，还请指教，谢谢！

it claim to宣称，标榜的意思啊

尽管电视媒体一直标榜深入探讨政治问题，.....

delve into....不常见的短语，我也不知道什么意思。不过后面有superficial，可以通过although的让步语气推断这个短语的意思恰好与superficial相反。

明白了，谢谢你哦