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A
which I think it is
B
which I think is
C
think which is
D
of which I think it is
正确答案 :B
解析
本题考查定语从句。 题目意为“他有一个新的发现,我认为这项发现对科技进步非常重要。” 分析题目可知,I think在题中作为插入语,去掉不影响句意,which在题中作关系代词代替discovery,放在从句句首作主语,即:I think the discovery(which)is of great importance.故不需要再有it作形式主语,所以B项符合题意,应当选。 故本题答案为B项。