—Susan you are doing worse. You have to more your study than computer games.—Yes. I mus

问题补充：

—Susan ,you are doing worse. You have to more your study than computer games.

—Yes. I must control myself.

A. concentrate;on

B. decide;on

C. take;on

D. spend;on

答案：

A. concentrate;on

B. decide;on

C. take;on

(答案→)D. spend;on

解析：句意：苏珊，你做的更糟。你必须花更多的时间于你的学习而不是电脑游戏。是的。我必须控制我自己。concentrate on 意思是集中精力于， 可直接接名词concentrate on sth 或接动词ing concentrate on doing sth 或 concentrate ones effort on sth/doing sth ；decide on sth下定决心做某事。decide to do sth决定做某事；take带走，拿走；spend花费，度过。所以选D。