[单选题]
    2-2. What does the author mean when he says, “we can’t turn the clock back” ?

A
A. It’s impossible to slow down the pace of change.
B
B. The social reality children are facing cannot be changed.
C
C. Lessons learned from the past should not be forgotten.
D
D. It’s impossible to forget the past.
正确答案:B
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