题目内容
2.David _____ a customer when the fire started.( )A. | served | B. | was serving | C. | had served | D. | would serve |
分析 大火开始的时候David正在为一位顾客服务.
解答 答案是B
根据从句的时态可得知主句要用过去的某种时态,但从句意分析,"大火开始"这个动作发生时,"David为顾客服务"这个动作正在进行,所以要用过去进行时,故答案选B.
点评 本题考查句子的时态,首先根据时间状语确定句子的基本时态,然后分析主句和从句之间的关系,确定题目的最佳答案.
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