He gave us another piece of advice, ____
题型:选择题
问题:
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
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