问题详情

What does the author mean when he says, "we can"t turn the dock back" (Para. 3) ？
A．It"s impossible to slow down the pace of change.
B．The social reality children are facing cannot be changed.
C．Lessons learned from the past should not be forgotten.
D．It"s impossible to forget the past.请帮忙给出正确答案和分析，谢谢！