问题描述：
When I was walk on the street,I saw a plane_____over my head.
空里面应该填什么?
A.flying
B.flies
C.fly
D.flew
谢谢喽````
空里面应该填什么?
A.flying
B.flies
C.fly
D.flew
谢谢喽````
问题解答：
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