Question

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

Answer 1

A

考查非限制性定語從句。句意“格林先生又有精彩的發(fā)現(xiàn)了，我認為這個發(fā)現(xiàn)對科學有重要意義。”I think是插入語，可去掉；be of+抽象名詞=抽象名詞對應的形容詞。B項的it多余；非限制性定語從句不能用that，排除C；引導詞作主語不能省略，排除D；故選A。