—Why do you look so tired? —Because we ________ for three hours without stopping.
A．work
B．worked
C．have worked
D．were working
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◎ 解析
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◎ 知识点
根据n多题专家分析，试题“—Why do you look so tired?—Because we ________ for three hours without stopping.A．workB．workedC．have workedD．were working…”主要考查了你对 【实义动词的单数第三人称形式】，【实义动词】，【动词短语】 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。
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