问题
选择题
When I was walking in the street yesterday, I saw a UFO _____ over my head. [ ]
A. flying
B. flies
C. flew
D. to fly
答案
答案：A
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When I was walking in the street yesterday, I saw a UFO _____ over my head. [ ]
A. flying
B. flies
C. flew
D. to fly
答案：A