(2013·高考山東卷)There is no simple answer,________ is often the case in science.
A.a(chǎn)sB.that
C.whenD.where
選A。句意:沒有簡單的答案,在科學上情況通常是這樣。因句中有逗號,其后面的句子中無連詞引導,可判斷是定語從句。本句的先行詞是空格前的整個句子,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不能引導非限制性定語從句,when的先行詞在后面的定語從句中作時間狀語,where 的先行詞在后面的定語從句中作地點狀語,故B、C、D三項都不符合句意,應被排除。
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