For many years, people electric ears. However, making them has been more difficult than p

发布时间：2020-08-16 11:48:49


For many years, people      electric ears. However, making them has been more difficult than predicted.
A. had dreamed of
B. have dreamed of
C. dreamed of
D. dream of

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A. had dreamed of
(答案→)B. have dreamed of
C. dreamed of
D. dream of
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