More and more young people are trying to do something:_______ the old.A.served.B.to serve.C.serve.D.serves.

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More and more young people are trying to do something:_______ the old.A.served.B.to serve.C.serve.D.serves.
More and more young people are trying to do something:_______ the old.
A.served.B.to serve.C.serve.D.serves.

More and more young people are trying to do something:_______ the old.A.served.B.to serve.C.serve.D.serves.
B to do 表示将来要去做,也表示目的
请及时采纳,多谢!

B
不定式to表示目的
越来越多的年轻人正试着做些事来为老人们服务

B 不定式表目的
这句话中已经有了谓语动词,所以只能选B,