请教GWD一题

ken178

The current economic downturn has significantly reduced advertising income both for business journals as well as general consumer magazines, especially if focusing on technology.

A.has significantly reduced advertising income both for business journals as well as general consumer magazines, especially if focusing

B.has significantly reduced advertising income both for business journals and for general consumer magazines, especially those focusing

C.significantly reduced advertising income for both business journals and for general consumer magazines, especially when focused

D.reduced both business journals’ and general consumer magazines’ advertising income significantly, especially if focused

E.reduced advertising income significantly for both business journals, as well as for general consumer magazines, especially those focusing

这题选B。我选D，ACE排除。但是轮到BD两个选项。B选项的those可以单独使用吗？代词不是都要加上名词吗？？？虽说我选D的时候也觉得EXPECIALLY这句话少了点什么。

ken178

我觉得if从句是应该要加主语的，D选项就错IF从句少了主语了。不过those 还是不明白指代哪部分????

Luxe

if 作为状语从句可以省略主语时，if从句的主语必须和主句一致，这么补出来就是 if the current economic downturn was focusing。。。。。

Luxe

if是连词 只能引导句子，D选项中 是个分词。
感觉 B中 those引导的部分是一个独立主格，做前面那句话的原因状语。
这里的those 不指代前面的任何一个成分，应该是magazines的意思
个人意见供参考。