They ___________ for two hours A. is working B. worked C. have been working D. had worked
2023-01-21 05:38:52 172次 2013届云南省高二9月月考英语题 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
They ___________ for two hours
A. is working B.
worked C. have been working D. had worked
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