Since the 1980s, it ______ possible to listen to British and American English at the flick of a switch.
| A. is | B. has been |
| C. had been | D. was |
Since the 1980s, it ______ possible to listen to British and American English at the flick of a switch.
| A. is | B. has been |
| C. had been | D. was |