【SAT文法】改进句子题

问题描述:

【SAT文法】改进句子题
St.Petersburg was renamed Leningrad after the (Russian Revolution,its original name was restored seventy years later.)
A.Russian Revolution and it got back its original name seventy years later
B.Russian Revolution; its original name was restored seventy years later.
不选A是因为B比较接近原句还是A有语法错误?

因为B比较接近原句,不是A有语法错误