314. Founded in 1983, the magazine increased its circulation more than double since then, and its advertising.

(A) increased its circulation more than double since then,

(B) has since increased its circulation more than double,

(C) has since more than doubled its circulation

(D) since then more than doubled its circulation（C）

(E) more than doubled its circulation since then

Since then 和since的区别？？？

To my understanding，

since 用在时间点后

since then 用在事件后，即其之前多用完整句子来刻画某事件发生了。

这里，founded in 1983 并不是完整句子，而是分词结构，所以应用 since

我觉得这个题目的考点

1) double里已经含了increase的意思，所以不能说increase....double，所以，A&B不对

2)按语意来讲，特别是since的存在，应该用完成时态，所以D&E不对

答案是C

另外，since then放在最后的化，割裂了circulation 和 advertising，感觉也不太对

不知道分析的有没有道理：）