A．People can call you back if necessary.B．You can dial a special number free.C．You don’t need to pay for a long-distance call.D．You can get a credit coupon when you give the phone number.
A．People can call you back if necessary.
B．You can dial a special number free.
C．You don’t need to pay for a long-distance call.
D．You can get a credit coupon when you give the phone number.