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题目
题型:不详难度:来源:
David _____ a customer when the fire started.
A.servedB.was serving C.had servedD.would serve

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。
核心考点
试题【David _____ a customer when the fire started.A.servedB.was serving C.had servedD】;主要考察你对一般现在时等知识点的理解。[详细]
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