问题

Since the 1980s, it ______ possible to listen to British and American English at the flick of a switch valign=”top” style=”width:190.8pt;padding:0cm 5.4pt 0cm 5.4pt”
A: is
B: has been
C: had been
D: was
B: has been
C: had been
D: was
正确答案是:
同类题型
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