题目内容：

9.In recent years much more emphasis has been put ________ developing the students productive skil
A.onto
B.over
C.in
D.on

优质解答

选B put over 放在……之上,使转向put onto 向…介绍；向…提供（资料）put in花费,付出（时间、精力等）put on 1.穿上,戴上; 把…放在…上2.上演,演出; 展览3.假装,装出,夸大4.增加; 增加(费用)5.打开6.做饭菜7.装(...