He has made another wonderful discovery, ______of great importance to science.
A、
which I think it is
B、
of which I think is
C、
I think which is
D、
which I think is
【正确答案】
D
【答案解析】
解析：本题考查非限制性定语从句的用法，先行词是another wonderful discovery，关系代词在从句中充当宾语，所以用which。
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