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David _____ a customer when the fire started.


  1. A.
    served
  2. B.
    was serving
  3. C.
    had served
  4. D.
    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。
考点:考查时态。
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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