请选择ABC'G)S5S8T*m1` I often do my homework_______ weekends.;S:X6J:X3l/a-E/C,V4B
A. in;S:X6J:X3l/a-E/C,V4B
B. on;S:X6J:X3l/a-E/C,V4B
C. of;S:X6J:X3l/a-E/C,V4B