单选题
He has made another wonderful discovery, ____ of great importance to science.
A、
which I think is
B、
which I think it is
C、
I think which is
D、
of which I think it is
【正确答案】
A
【答案解析】
“which I think is”是“which”引导的一个非限定性定语从句，此处修饰“discovery”。故选A。此句意为：他已经创造了另外一个伟大的发现，我认为对科学是至关重要的。
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