初中|英语

(   ) 21.— It’s _____ useful book, yes?           — Yeah, it tells us how to play _____ piano.A. an, the                           B. a, /                   C. a, the(   ) 22. —      is it from here to the train station?— It’s about 5 kilometers.A. How long                       B. How far                        C. How many