David _____ a customer when the fire started．A．servedB．was serving C．had servedD
题型：不详难度：来源：
David _____ a customer when the fire started．| A．served | B．was serving | C．had served | D．would serve |
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答案
| B |
解析
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。 |
举一反三
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Do you know the thief_______by the police.| A．has been catching | B．has caught | C．has been caught | D．will caught |
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