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    3．Do you doubt ______eating raw vegetables is beneficial to our physical health？（　　）
    A．thatB．whether．C．ifD．which

    分析 你怀疑吃生蔬菜对我们的健康有益吗？

    解答 答案为A．本题考查名词性从句中引导词的运用．that表示"确定的信息"，在名词性从句中不担任成分，无意义，除宾语从句外，that不可省略；whether/if 表示"是否"，在从句中不担任成分；if 一般只引导宾语从句； which 在名词性从句中表示"选择"，做主语、宾语或表语；题干中动词doubt后接的宾语从句，表示对某个"确定"的事实怀疑，从句从意思到成分都是完整的，故用that，答案是A．

    点评 名词性从句考查的关键是连接词的选用和语序，因此，我们首先要搞清从句的性质，掌握各连接词的用法，在此基础上判断．此外，关注名词性从句用陈述语序．

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