请选择ABCD7u0Y+@-m0M-]7b-Y --I ____ Chinese hard last year. --But you are not studying hard now.3S-M0b:`-z+b5H
A .study3S-M0b:`-z+b5H
B. am studying3S-M0b:`-z+b5H
C. was studying3S-M0b:`-z+b5H
D. studied3S-M0b:`-z+b5H