Mr. Wells has found some new clues in his investigation ______ of great importance to sol
正确答案
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Mr. Wells has found some new clues in his investigation, ______ of great importance to solve this criminal case.
A．I think which is
B．that I think is
C．which I think is
D．which I think it is
请帮忙给出正确答案和分析，谢谢！
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正确答案：C
非限定性定语从句用法。在本句中，which引导了一个包含插入语Ithink的非限定性定语从句。A中which的位置不对，B中that不能引导非限定性定语从句，D中多了代词it。beofimportance相当于beimportant。