He has made a discovery ( ) of great importance to the progress of science and technology.A. which I think it isB. which I think isC. I think which isD. of which I think it is
He has made a discovery ( ) of great importance to the progress of science and technology.
A. which I think it is
B. which I think is
C. I think which is
D. of which I think it is
B. which I think is
C. I think which is
D. of which I think it is
参考解析
解析：考查定语从句。该句中discovery是先行词，放到句子中是I think the discovery is of great importance。不需要it，故选项B正确。A项多了个it，排除;C项语序错误，排除;D项不符合英语表达，排除;答案选B。
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