So lost in their computers____that leaders at summer computer camps often have to force them to break for sports and games.

A．became the children

B．become the children

C．had the children become

D．do the children become

中国药典的凡例分类项目，下列说法正确的是（）

A.名称及编排

B.检验方法和限度

C.精确度、指示剂

D.标准品、对照品

E.以上都不是