题目内容：

betty -------(be)not in.she——(go)to the library.

优质解答

is has gong
1)用现在完成时
2）辨析三个经常用的
have benn to 是去了也回来了,你可以看见他
have gong to 是去了还没回来,你不能见她
have been in 是指去某地的次数