–Why did you arrive so late?

--        , we were left waiting for the bus in the rain for two hours!

A．Believe or not

B．To begin with

C．Forget it

D．In the end

《普通高中数学课程标准(实验)》认为：学生的数学学习活动不应仅限于接受、记忆、模仿和练习，还应倡导自主探索、______、合作交流、______等学习方式。