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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