( ) More and more young people are trying to do something _____ the old .A.served B.to serve C.serve D.serves 讲解原因

问题描述:

( ) More and more young people are trying to do something _____ the old .
A.served B.to serve C.serve D.serves 讲解原因

B.to serve 动词不定式表示目的,做某事的目的是服务老人.