◎ 题干
He gave us another piece of advice, _____ of great help to the research work.

[     ]

A. which I think is
B. which I think it is
C. I think which is
D. I think it is
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“He gave us another piece of advice, _____ of great help to the research work. [ ]A. which I think is B. which I think it is C. I think which is D. I think i…”主要考查了你对  【关系代词】【非限制性定语从句】  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。