问题 选择题
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
答案

答案:B

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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