It is true that volunteering can help others,and it can also help you.这里的it是指volunteering can help others还是volunteerring can help others,and it can also help you.全部呢,为什么呢?
此问题重复,已有解答。It 的指代作用分析 - 柯帕斯英语网 (cpsenglish.com)
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