请选择ABCD)K8~4x3]*H.t4D)?4R;j4Z I often tell my son not to move _________ the bus stops ..g2@/v1R5t7i*P7V,l2I
A. till.g2@/v1R5t7i*P7V,l2I
B. on.g2@/v1R5t7i*P7V,l2I
C. at.g2@/v1R5t7i*P7V,l2I
D. of.g2@/v1R5t7i*P7V,l2I