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题目内容
（河南科技大学大学英语3(专升本)）
He has made another wonderful discovery, ______ of great importance to science and man.
选项:
A:which I think is
B:which I think it is
C:of which I think it is
D:I think which is
选项:
A:which I think is
B:which I think it is
C:of which I think it is
D:I think which is
参考答案
