◎ 题干
The expert offered us another piece of advice,_____of great help to our program. 
A.I think it is
B.I think which is
C.which I think it is
D.which I think is 
◎ 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“The expert offered us another piece of advice,_____of great help to our program. A.I think it isB.I think which isC.which I think it isD.which I think is …”主要考查了你对  【状语从句】【限制性定语从句】【主语从句】【同位语从句】  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。