◎ 题干
The farmers ________ on the farm when a UFO flew over their heads.

[     ]

A. worked
B. work
C. are working
D. were working
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“The farmers ________ on the farm when a UFO flew over their heads. [ ]A. worked B. work C. are working D. were working …”主要考查了你对  【过去进行时】  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。