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
考查非限制性定語(yǔ)從句。句意“格林先生又有精彩的發(fā)現(xiàn)了，我認(rèn)為這個(gè)發(fā)現(xiàn)對(duì)科學(xué)有重要意義�！盜 think是插入語(yǔ)，可去掉；be of+抽象名詞=抽象名詞對(duì)應(yīng)的形容詞。B項(xiàng)的it多余；非限制性定語(yǔ)從句不能用that，排除C；引導(dǎo)詞作主語(yǔ)不能省略，排除D；故選A。
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