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
B
考查時(shí)態(tài)：時(shí)間是since the 1980s，和現(xiàn)在完成時(shí)連用，句意：自從20世紀(jì)80年代開(kāi)始，在輕彈開(kāi)關(guān)我們一直可以聽(tīng)到英式英語(yǔ)和美式英語(yǔ)。選B。
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