问题描述：
he has made a discovery,_______ of great importance to the progress of science and technology.
A.which I think is B.that I think is C.I think which is D.of which I think it is
并且 分析一下其他选项!
A.which I think is B.that I think is C.I think which is D.of which I think it is
并且 分析一下其他选项!
问题解答：
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