题目内容：

Bill told me that he was saw a UFO _____ over his head last night .
A.fly
B.flies
C.flew
D.is flying
回答的同时也请说出理由谢谢.

优质解答

A
see sb./ sth.do 结构

追问：

see后面是跟动词原形吗？

追答：

感官动词 see 后跟动词有两种结构： see... do 和 see... doing