The physicist has made a discovery, ______ of great importance to the progress of science and technology.[1997]
A、
I think which is
B、
that I think is
C、
which I think is
D、
which I think it is
【正确答案】
C
【答案解析】
解析：此空所在分句是作名词discovery的非限制性定语从句，因此关系代词用which不用that。故C正确。
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