摘要：28．He gave us another piece of advice, of great help to the research work. A．which I think it is B．I think which is C．which I think 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 |
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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