单选题
He has made a discovery, ___ of great importance to the progress of science and technology.
Awhich I think it is
Bwhich I think is
Cthink which is
Dof which I think it is
正确答案
答案解析
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