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    20．______ more efficiently，they stopped to have a coffee break．（　　）
    A．WorkingB．To workC．WorkD．Worked

    分析 为了工作更有效率，他们停下来喝杯咖啡休息一下．

    解答 答案：B 题干中有逗号分隔，没有连词，要用非谓语动词；work与主语they之间是主动关系；句意表达的是目的，是一个目的状语，不是表示伴随动作，要用动词不等式表示．故选B．

    点评 动词不等式是非谓语动词的一种，也是英语中比较活跃的一类结构．通常用来作主语，宾语，表语，定语，状语等．学习时要全面掌握，熟练运用．

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    A. Their wings are long and wide.

    B. They can hover in the air for a long time.

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    C．David Kamp is a UK editor for the Guardian．
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