问题补充：
Mr. Green has made another wonderful discovery, great
importance to science.
A. which I think is of
B. which I think it is of
C. that I think is of
D. I think which is of
答案：
(答案→)A. which I think is of
B. which I think it is of
C. that I think is of
D. I think which is of
解析：考查非限制性定语从句。句意“格林先生又有精彩的发现了，我认为这个发现对科学有重要意义。”I think是插入语，可去掉；be of+抽象名词=抽象名词对应的形容词。B项的it多余；非限制性定语从句不能用that，排除C；引导词作主语不能省略，排除D；故选A。
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