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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
考查時態(tài)：時間是since the 1980s，和現在完成時連用，句意：自從20世紀80年代開始，在輕彈開關我們一直可以聽到英式英語和美式英語。選B。
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