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    2．They promised to develop a software package by the end of this year，________ they might have．（　　）
    A．however difficultB．how difficult
    C．whatever difficultyD．what difficulty

    分析 他答应无论有什么困难，年底都要开发一个软件包．

    解答 答案：C
    题干中从句they might have缺少宾语，要用名词或代词；how修饰形容词或副词，what修饰名词；what连接名词性从句，whatever连接状语从句，表示无论什么．故选C．

    点评 连词用来连接从句，按类型可分为：从属连词，连接代词，连接副词．学习时，要注意区分．

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