Doctor Smith has made another wonderful discovery, _______ great importance.

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

C. which is I think D. I think which is

 

A

【解析】

試題分析:句意:斯密斯博士做出另外一個發(fā)現(xiàn),這我認為是很重要的。這里使用了非限制性定語從句,修飾discoverywhich在定語從句中做主語,I think是插入語,選A

考點:考查非限制性定語從句和插入語

 

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