Doctor Smith has made another wonderful discovery, _______ great importance.
A．which I think is ofB．which I think it is of
C．which is I thinkD．I think which is
A

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discovery，which在定語從句中做主語，I think是插入語，選A。
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