[求助]求助一题（一本备考书上的题目）

Because the Ebola virus is easily destroyed and it is therefore a most exclusive virus, it is being increasingly viewed  as a threat to sub-Saharan life.

A. and it is therefore a most exclusive virus, it is being increasingly viewed

B. it is therefore a most exclusive virus, and it has increased viewed

C. and therefore a most exclusive virus, it is being increasingly viewed

D. and therefore it is the most exclusive virus, there is increasing view

E. therfore being the most exclusive virus, it is increasingly viewed

Correct: C

书上解释说：You are asked to understand the issue of parallel construction. 我怎么看不怎么出来是在考平行问题？而且不是说being 在选项中一般都是错的吗？到底being 的用法是怎样的，请牛牛们指教！谢谢

1. 这里去掉 it is 不影响句义的理解。主语都是 Ebola virus, 用 and 连接了两个宾语。

2. being 这里是不错的。如果你把它省略了，就没有渐进的被动语气了。另外，being 在介词后面也不一定错误。

如果有平行的话,是不是指"Because...and therefore...".(有这种用法吗,because 和 therefore (so?)同时出现)

此处的Being是被动的现在进行时.

这句话的意思(逻辑)是什么? "因为...所以...,然而...?"

Because the Ebola virus is easily destroyed and therefore a most exclusive virus   划线部分平行

= because the Ebola virus is easily destroyed + becuase the Ebola virus is a most exclusive virus

therefore 这里表示由 easily destroyed 推出的结论，和 because 无关

谢谢！

   Thx!!! I got it