题目选项分析

In the early days of the Soviet Union, much of the national politicians’ professional energy was focused into purges of counter-revolutionaries and when they persecuted and eliminated the Trotskyist party that once harbored them.

In the early days of the Soviet Union, much of the national politicians’ professional energy was focused into purges of counter-revolutionaries and when they persecuted and eliminated the Trotskyist party that once harbored them.