欧洲地形特征不包括（　　）

A．世界上海拔最低的大洲

B．山地主要分布在南北两侧

C．地面起伏大，高低悬殊

D．地面起伏小

The time he has devoted in the past years __________ the disabled is now considered

to be __________ great value __________ him.

A．to help; of; for

B．to helping; /; to

C．to help; in; of

D．to helping; of; to