For many years, people _____electric car_爱下问搜题

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问题选择题

For many years, people _____ electric cars. 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

答案：B

填空题

竞技性体操包括（）、（）和（）、蹦床运动、艺术体操。

问答题简答题

波特五力分析包括哪些要素？