◎ 题干
They are very grateful _______ us _______ them so much help.
A.to, to giveB.of, to giveC.for, giveD.to, for giving
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“They are very grateful _______ us _______ them so much help.A.to, to giveB.of, to giveC.for, giveD.to, for giving…”主要考查了你对  【介词短语】【介词】  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。