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He made another wonderful discovery, _______ of great importance to science.

A．which I thinkB．which I think itC．which I think isD．I think which is

C

解析試題分析：考查定語從句：句意：他又有了一個重大的發(fā)現(xiàn)，這我認為對科學(xué)是非常重要的。I think 是插入語，可以忽略，剩余的就是一個很明顯的which指代前邊整個句子（事實）引導(dǎo)的一個非限定性定語從句。Which在定語從句中做主語，it是多余的，定語從句中系表結(jié)構(gòu)，is不能缺，還有插入語應(yīng)該在which后面，選C。
考點：考查定語從句

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