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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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 |