新中国成立前的人民公安机关主要有( )。

A．中央特科

B．国家政治保卫局

C．陕甘宁边区和各敌后抗日根据地的人民警察

D．社会部和各解放区的公安保卫机关

The man in front of me came to _______a sudden stop ______I almost ran into him.

A．such; that

B．such; as

C．so; that

D．so; as