题目内容
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
解析试题分析：句意：斯密斯博士做出另外一个发现，这我认为是很重要的。这里使用了非限制性定语从句，修饰discovery，which在定语从句中做主语，I think是插入语，选A。
考点：考查非限制性定语从句和插入语
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