(2013·山東卷)There is no simple answer，________is often the case in science.
A．a(chǎn)s　B．that
C．when 　D．where
A
句意為：科學(xué)往往如此，它沒有一個簡單的答案。本題考查定語從句。設(shè)空處前有逗號，故判斷設(shè)空處引導(dǎo)非限制性定語從句。空格處的引導(dǎo)詞在從句中作主語，排除C、D兩項；that不能引導(dǎo)非限制性定語從句。
答案：　A
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