求解几道sat语法题

求解几道sat语法题
1、Sam is a professor of theoretical physics,(while his brothers are architects) with outstanding reputations.
正确答案是and his brothers are architects.这里while为啥不行啊?
2、St.Petersburg was renamed Leningrad after the (Russian Revolution,its original name was restored seventy years later)
B.Russian Revolusion and it godt back its original name seventy years later
C.Russian Revolusion; its original name was restored seventy years later.
为啥选C不选B呢?
3、(Although the actors never having rehearsed their lines,) they performed badly.
C、Having never rehearsed their lines
E、The actors,however,never rehearsed their lines
可是C得话主语actor不就没了吗orz?