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    6．Our math teacher is always ready to help us and asking for nothing _________．（　　）
    A．in turnB．in returnC．in caseD．in addition

    分析 我们数学老师总是乐于帮助我们，不求回报．

    解答 答案：B．根据句意，ask for nothing不要求任何东西，而in return为回报，ask for nothing in return不求回报，故选B．A．in turn轮流地，C．in case万一，假使，D．in addition另外，还有，均不合题意．

    点评 本题考查介词短语的辨析，需要学生对介词短语的固定搭配多加记忆和区分，根据句意选择合适短语．

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