GMAT语法问题ThethirteenoriginalBritishcoloniesinNorthAmerica,someformedascommercialventures,othersasreligioushavens,eachhadawrittencharterthatsetforthitsformofgovernmentandtherightsofthecolonists.A.someformeda

　　GMAT语法问题

　　ThethirteenoriginalBritishcoloniesinNorthAmerica,someformedascommercialventures,othersasreligioushavens,eachhadawrittencharterthatsetforthitsformofgovernmentandtherightsofthecolonists.

　　A.someformedascommercialventures,othersasreligioushavens,eachhadawrittencharter

　　B.somebeingformedasacommercialventure,othersasreligioushavens,allofwhichhadwrittencharters

　　C.somethatformedascommercialventures,othersasreligioushavens,allhadwrittencharters

　　D.withsomebeingformedasacommercialventure,othersasreligioushavens,allhadawrittencharter

　　E.withsomeformedascommercialventures,whileothersasreligioushavens,eachhadawrittencharter

　　正确答案选A；A中既然each做独立主格就不能有谓语,但是had怎么解释