Thelocalareanetworkalsoconnectstoawideareanetworkthatallowamessage______acrossthecountryortoothercountries.
A.is sent B.to be sent C.sending D.send正确答案B
Thelocalareanetworkalsoconnectstoawideareanetworkthatallowamessage______acrossthecountryortoothercountries.
A.is sent B.to be sent C.sending D.send正确答案B