He has made another wonderful discovery, ______ of great importance to science and man. A. which I think is B. which I think it is C. of which I think it is D. I think which is

He has made another wonderful discovery, ______ of great importance to science and man.
A. which I think is B. which I think it is C. of which I think it is D. I think which is

出自：统招专升本-----英语

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