1.        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

why c? since 可以这样用啊。不懂啊。

我觉得这道题考了两点，

第一，since then 要用完成时，这样排除掉了A,D,E

第二，之所以把its circulation 放在后面，是为了 和 its advertising 连接，因为

这两个都是成倍增加的，如果选b，就会产生run-on sentence.