I don't know who invented ________ telephone, but it's really ________ most wonderful invention.

A．the；a

B．/；the

C．a；the

D．/；a

Totally _____ accident, the businessman got hold of a ten-pound fake banknote that was believed to ______ two hundred years ago.

A．by; have been issued

B．with; have come into use

C．in; have come out

D．at; have come into being