great changes----in china since 1919A have been taken place B have taken place为什么答案是B 为什么 不用被动语态

问题描述:

great changes----in china since 1919
A have been taken place B have taken place为什么答案是B 为什么 不用被动语态

变化发生不是被动是,是自己发生的,不用被动语态,所以选B