乐观可以通过一定的方式开发与训练，主要有（）

A、学会对过去宽容

B、虚心向榜样学习

C、学会正确评价现在

D、学会为将来寻找机会

So involved with computer games________that teachers at summer computer camps often have to

force them to break for sports and music.

A．became the children

B．become the children

C．had the children become

D．do the children become