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

支气管插管的禁忌证是（）

A．有喉水肿的患者

B．支气管胸膜瘘

C．支气管扩张

D．手术时需一侧肺塌陷

E．单侧肺脓疡