问题描述：
Teenagers should lesrn to do things ___________.
A. for themselves B. by themselves C. themselves D. all the above 应该选哪个? 是B 还是D?请说明一下.
A. for themselves B. by themselves C. themselves D. all the above 应该选哪个? 是B 还是D?请说明一下.
问题解答：
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