15.was not 16.has seen 17.go 18.were not staying 19.Has been 20.did buy 21.was 22.has not been23.was studying
用所给词的适当形式填空,15~23题.
15.was not 16.has seen 17.go 18.were not staying 19.Has been 20.did buy 21.was 22.has not been23.was studying