问题补充:
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
答案:
A. had dreamed of
(答案→)B. have dreamed of
C. dreamed of
D. dream of
解析:可联系答.案.网客服索取。
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