Edison made a lot of inventions, of great importance．A.which I think areB.which
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Edison made a lot of inventions, ________ of great importance．
A.which I think are
B.which I think they are
C.which I think they
D.I think which are
试题答案
A
I think是插入语。which是关系代词，其先行词是inventions，引导非限制性定语从句。