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    【题目】 ____ they are working ! We should learn from them.

    A. What hard B. What hardly

    C. How hard D. How hardly

    【答案】C

    【解析】试题分析：句意：他们工作多努力啊!我们应该向他们学习。此题考查的是感叹句，“工作努力”应用副词hard，因此感叹句也应用how开头，故选C。

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