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    精英家教网 > 高中英语 > 题目详情

    ______ is often the case in science, there is no simple answer

    A．ThatB．AsC．WhenD．Where

    B

    解析试题分析：句意为：正如在科学上一样，没有那么简单的答案。从句中缺少主语，四个选项中只有as能够做主语。when /where 在从句中状语，that引导定从不放句首，不用于非限制性定语从句，故应为B。
    考点：考查定语从句的用法。

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