問題詳情
17. In the 1990s, beepers_____ by three __ people in Taiwan, but now, they _______ athing of the past.
(A) were used ； million of ； were
(B) have been used ； millions ； are
(C) was used ； millions of ； were
(D) were used； million； are
參考答案
答案：D
難度：困難0.231
書單：沒有書單，新增
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