◎ 题干
—Did you see Tom at the party? 
—No, he _______  by the time I got there.

A. left
B. was leaving
C. had left
D. have left
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“—Did you see Tom at the party?—No, he_______by the time I got there. [ ]A. left B. was leaving C. had left D. have left…”主要考查了你对  【过去完成时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。