He made another wonderful discovery, ______ of great importance to science.

A. which I think is　　　　　 B. which I think it is

C. which I think　　　　　　 D.I think which is

 

A

 

考查非限制性定語從句及插入語。此處I think為插入語，which是定語從句的關系代詞。

 

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