二、单项填空(本大题共14分,每小题1分)
( ) 21. Lucy and Lily haven’t met each other ___________ they left school last July.
A. from B. before C. since D. after
( ) 22. --- I think the young man acted very well in this film.
--- I don’t think so. __________, the story itself is interesting.
A. So B. But C. Anyway D. otherwise
( ) 23. --- Have you returned the book to the library__________?