问题
选择题
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 it is
答案
答案：A
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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
答案：A