(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

【解析】句意為：科學(xué)往往如此，它沒有一個(gè)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�？崭裉幍囊龑�(dǎo)詞在從句中作主語，排除C、D兩項(xiàng)；that不能引導(dǎo)非限制性定語從句。

答案：　A

 

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