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.

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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.

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.
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.

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.
B,独自、独立 意思来看,应该是十来岁的人应该学会独立做事.