题目选项分析

In one of the most surprising victories in WWI, the newly formed Russian communist state was routed by the Polish General, Jozef Pilsudski, and their demand to push back its borders east of Vilnius.

In one of the most surprising victories in WWI, the newly formed Russian communist state was routed by the Polish General, Jozef Pilsudski, who demanded that it push back its borders east of Vilnius.