请选择DCBA'?:e'[4i;B2?,S8m:}-d David goes to school-Z-A0l6Y0S8x(L.A+]1v5W.w1{9n4I every day.'y;y9u6F;]-\4@1J0c0I4^
A．by a bike'y;y9u6F;]-\4@1J0c0I4^
B．by his bike'y;y9u6F;]-\4@1J0c0I4^
C．on his bike'y;y9u6F;]-\4@1J0c0I4^
D．on bike'y;y9u6F;]-\4@1J0c0I4^