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    6．It worried her a bit           she is becoming weaker and weaker．（　　）
    A．whatB．whetherC．thatD．why

    分析 她变得越来越虚弱，这让她有点担心．

    解答 答案为C．本题考查名词性从句中引导词的运用．题干中是it做形式主语，空格后面为真正的主语从句；从句为完整的句子，所以选用不担任成分，不表达意思的that，故选C．what 在从句中可以充当主语、宾语或表语，不符题意；whether表示"是否"，不符合题意；why表示原因，在句中做状语，不符合题意．

    点评 名词性从句考查的关键是连接词的选用和语序：名词性从句用陈述语序；掌握各连接词的用法，在此基础上判断．

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