Since the 1980s, it possible to listen to British and American English at the flick of a

发布时间：2020-08-16 15:17:29

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

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解析：考查时态：时间是since the 1980s，和现在完成时连用，句意：自从20世纪80年代开始，在轻弹开关我们一直可以听到英式英语和美式英语。选B。
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