请选择CBA.d*l.q+A0h5O/s9p;`'s*?9K5x,^*j'P2j4T;rI usually go to school __________ seven __________ the morning.'Q3O)p;N:f:}.p-I.]0g
A. at, on'Q3O)p;N:f:}.p-I.]0g
B. at, in'Q3O)p;N:f:}.p-I.]0g
C. about, on'Q3O)p;N:f:}.p-I.]0g