begin存在被动语态么
问题描述：
begin存在被动语态么
___ in 1995,the Metro system for China's commercial capital has doubled in reach to 420km in just the past year; Shanghai did in 15 years ___ London did in 150.
Begun; what
可老师说过begin主动带被动啊,怎么用begun呢?
答
没有被动式.那题是怎么回事呢？题里begun是begin的过去式。