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