When I opened the door I found my son completely a game.A. absorbing inB. absorbed to C.

问题补充：

When I opened the door I found my son completely a game.

A. absorbing in

B. absorbed to

C. absorbed in

D. absorbing to

答案：

A. absorbing in

B. absorbed to

(答案→)C. absorbed in

D. absorbing to

解析：考查固定词组。固定词组be absorbed in…沉浸于…；本题中absorbed in a game是对宾语my son进行补充说明。句意：当我打开门的时候，我发现我的儿子完全沉浸在游戏之中。故C正确。