超级巧哦,这个点我不小心从别地儿看到了~希望有帮助:
Ron大神:关于补出helping verb的一个formal usage的问题
if you WERE going to include "did", preferred usage conventions actually place it BEFORE its subject: "...as did the civilizations in the nile delta..." PS(OG12的85题)
one would never speak this way, but it's the best way to write these sorts of constructions in formal usage.