A:①②③
B:①③④
C:①②④
D:②③④
孙晨同学是历史迷,尤其对历史地图颇有研究。他惊奇地发现在19世纪初和20世纪初欧洲版图发生了重大变化,经过分析,他得出变化的正确原因是 ( )
_________ Henry's mother ________ his father speaks English. They both speak Chinese.