问题标题：
Thephysicisthasmadeadiscovery，_____isofgreatimportancetotheprogressofscienceandtechnology．（）A.IthinkwhichB.thatIthinkC.whichIthinkD.whichIthinkit
问题描述：
The physicist has made a discovery，_____ is of great importance to the progress of science and technology．（）
A.I think which
B.that I think
C.which I think
D.which I think it
喇培清回答：
答案：C
题干中is of great importance to the progress of science and technology是修饰discovery的一个非限制性定语从句；从句缺少主语，要用关系代词；Ithink是插入语，不影响句子结构；关系词后接从句，故选C．
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