另一道让人烦的语法题

 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

答案是E,为什么不是C呢？

是不是选c 前面就要用虚拟语气呢

还是从意思上理解,这里没有条件的意味,所以不用IF

as when类似于 比如当...

意思有区别,体会一下把