A.listening and speaking after reading and writing
B.listening and reading before speaking and writing
C.listening and writing after speaking and reading
D.listening and speaking before reading and writing
为了保护您的账号安全,请在“上学吧”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!