这些学生自愿用他们的空闲时间去帮助养老院的老人 These students______ _______ _______ their free time
问题描述：
这些学生自愿用他们的空闲时间去帮助养老院的老人 These students______ _______ _______ their free time
答
These studentsvoluntarily to help the elderly nursing home in their free time