问道语法题!

carrot2000UID: 12643

The 1897 discovery of gold in the Klondike hastened the commercial development of Washington State, as did the increasing trade with Pacific Islands.
后面的as did the increasing trade with Pacific Islands是什么用法啊,我觉得是不是改成so did 会比较好啊,9905上面的一道题,知道的说一声啊,谢谢了!!

zhangyan0516UID: 2150259

是as引导的倒装句，意思是discovery of gold in the Klondike hastened the commercial development of Washington State这个现象就如同the increasing trade  hastened
(did)with Pacific Islands.的现象一样。