I volunteer my time ( )others.A.help B.to help C.helping D.helped应该选哪一项啊,为什么?

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Ivolunteermytime()others.A.helpB.tohelpC.helpingD.helped应该选哪一项啊,为什么?Ivolunteermytime()others.A.helpB

I volunteer my time ( )others.A.help B.to help C.helping D.helped应该选哪一项啊,为什么?
I volunteer my time ( )others.
A.help B.to help C.helping D.helped
应该选哪一项啊,为什么?

I volunteer my time ( )others.A.help B.to help C.helping D.helped应该选哪一项啊,为什么?
及物动词 vt.
1.自愿(做)[(+to-v)]
They volunteered to repair the house for the old lady.
他们主动提出替老太太修缮房子.

b
to help不定式,表目的
我自愿花自己时间(volunteer my time)的目的是to help others