(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：科學往往如此，它沒有一個簡單的答案。本題考查定語從句。設空處前有逗號，故判斷設空處引導非限制性定語從句�？崭裉幍囊龑г~在從句中作主語，排除C、D兩項；that不能引導非限制性定語從句。
答案：　A
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