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【题目】There is no simple answer, is often the case in science.

A. when B. that

C. as D. where

【答案】C

【解析】句意:没有简单的答案,在科学上情况通常是这样。 is often the case in science是非限制性定语从句。本句的先行词是空格前的整个句子,且从句中缺少主语。选项中有此用法的是as。as在句中意为“正如,正像”。“as is often the case”常被看作是一个固定搭配,意为“情况通常是这样”,符合句意。that不能引导非限制性定语从句。

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