【題目】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：沒有簡單的答案，在科學(xué)上情況通常是這樣。 is often the case in science是非限制性定語從句。本句的先行詞是空格前的整個句子，且從句中缺少主語。選項中有此用法的是as。as在句中意為“正如，正像”�！�as is often the case”常被看作是一個固定搭配，意為“情況通常是這樣”，符合句意。that不能引導(dǎo)非限制性定語從句。

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