08PREP 190, 独立主格和同位语区别问题

190.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.
A. some formed as commercial ventures, others as religious havens, each hada written charter
B. some being formed as a commercial venture, others as religious havens,all of which had written charters
C. some that formed as commercial ventures, others as religious havens, allhad written charters
D. with some being formedas a commercial venture, others as religious havens, all had a writtencharter (A)
E. with some formed as commercial ventures, while others as religioushavens, each had a written charter
答案是A

语法笔记上说some…作为 the thirteen ...的同位语
each ... 作为 the thirteen original British colonies的同位语
这两个同位语之间不用加连词吗