①提出了明确的反帝要求
②主力军发生重要变化
③拥有更为广泛的群众基础
④反封建的成果更大
A:①②③④
B:①②③
C:②③
D:①④
His father likes going hiking. _______.
合并同类项:﹣x2﹣x2=____