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Mr. Green has made another wonderful discovery,  ______ great
importance to science.
A.which I think is ofB.which I think it is of
C.that I think is ofD.I think which is of
A
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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