He has made a discovery, ___ of great im

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问题 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.think which isD.of which I think it is

选项 A.which I think it is
B.which I think is

C.think which is

D.of which I think it is

答案 B

解析本题主要考查定语从句，全句意为“他有了一项新的发现，我认为这项发现对科技进步非常重要。”I think 作插入语，去掉不影响句意，which在这里作关系代词代替discovery，放在句首在从句中作主语，即：I think the discovery（which）is of great importance..。不需要再有it作形式主语。

考点
定语从句

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