【題目】I’m sure most of us will volunteer our time ______ other people.

A. in helping B. on helping C. help D. to help

【答案】D

【解析】句意:我確信我們中的絕大部分人自愿留出時(shí)間去幫助其他的人。短語volunteer one’s time to do sth自愿犧牲時(shí)間做某事。故選D。

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