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    精英家教网 > 高中英语 > 题目详情
    David _____ a customer when the fire started．
    A．servedB．was serving C．had servedD．would serve
    B

    试题分析：句意：当大火开始时正在服务一个客户。从从句的谓语动词可知与过去有关，四个选项均为过去时态。这里表示一个动作发生的时候，另一个动作正在进行。故用过去进行时。
    点评：时态题的考查要注意关键词，本题的关键词是when引导的时间状语从句！说明一个动作发生的时候，另一个动作正在进行。时态的考查要注意两方面：一是时间状语，二是上下文的语境。
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