-Is Jack in the library?-Maybe.I saw him ______

问题描述:

-Is Jack in the library?-Maybe.I saw him ______
-Is Jack in the library?
-Maybe.I saw him ______ out with some books just now.
A.going.B.go.C.to go.D.went.

A 因为看到他的时候他正在往外走,所以用进行式
请及时采纳,多谢!