请教下楼主~
The thirteen originalBritish colonies in North America, some formed as commercial ventures,others as religious havens, each had a written charter that set forth itsform of government and the rights of the colonists.
这个句子里面that指代谁呢?是指代a written charter吗?那为什么后面的set forth用单数呢?
谢谢前辈!