◎ 题干
Some ______are ______their time to help the old people.
A.volunteer; volunteer B.volunteers; volunteering
C.volunteering; volunteers D.volunteers; volunteers
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“Some ______are ______their time to help the old people.A.volunteer; volunteer B.volunteers; volunteering C.volunteering; volunteers D.volunteers; volunteers…”主要考查了你对  【助动词】【介词短语】【固定搭配】【疑问词组】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。