The visiting professor gave us some advice,________ of great help to our English learning.
| A．I think it is | B．I think which is | C．which I think is | D．which I think it is |
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The visiting professor gave us some advice,________ of great help to our English learning.
| A．I think it is | B．I think which is | C．which I think is | D．which I think it is |
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