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。