请选择ABC.z8j8|2h.G:v The birds sing______.7x4?0r2a3S4_0z4O7m-R1H
A．beautifully7x4?0r2a3S4_0z4O7m-R1H
B．beautiful7x4?0r2a3S4_0z4O7m-R1H
C．beauty7x4?0r2a3S4_0z4O7m-R1H