问题补充:
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
答案:
A. I think it is
B. I think which is
(答案→)C. which I think is
D. which I think it is
解析:可联系答.案.网客服索取。
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