题目内容
He made another wonderful discovery, _______ of great importance to science.
| A．which I think | B．which I think it | C．which I think is | D．I think which is |
C
解析试题分析：考查定语从句：句意：他又有了一个重大的发现，这我认为对科学是非常重要的。I think 是插入语，可以忽略，剩余的就是一个很明显的which指代前边整个句子（事实）引导的一个非限定性定语从句。Which在定语从句中做主语，it是多余的，定语从句中系表结构，is不能缺，还有插入语应该在which后面，选C。
考点：考查定语从句
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| A．what | B．when | C．where | D．which |
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| A．why; that | B．that; why | C．because; why | D．of which; that |
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| A．which | B．that | C．one | D．place |
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| A．that | B．which | C．what | D．this |
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| A．whom | B．their | C．whose | D．them |
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| A．when | B．where | C．that | D．which |
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| A．which | B．where | C．what | D．whose |