语法与词汇
He has made another wonderful discovery, _____ of great importance to science.
A、
who I think it
B、
which I think it is
C、
that I think is
D、
which I think is
【正确答案】
D
【答案解析】
句意：他又有了一个杰出的发现，这一发现对科学具有很大意义。本题考查定语从句。句中I think为插入语，先行词为discovery，在定语从句中作主语，故选D。
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