2. 外语
  3. A lot of people used to【B1】of flying like birds. Now this dream has been【B2】for a long time. They have built airplanes of differ

A lot of people used to【B1】of flying like birds. Now this dream has been【B2】for a long time. They have built airplanes of differ

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问题 A lot of people used to【B1】of flying like birds. Now this dream has been【B2】for a long time. They have built airplanes of different sizes and【B3】types to【B4】? various needs. And there are lots of ways for people to fly,【B5】.
Astronauts (宇航员) have landed【B6】the moon and some day they will visit Mars (火星). Spacecraft have already【B7】far-away planets and ’sent information【B8】the Earth. Airplanes【B9】millions of people every year. Some of us have already been in one of them. Flying has brought people a lot of fun and【B10】.
选项 A、dreaming
B、dream
C、dreamt
答案B
解析 used to do sth．表示过去常常做什么，而现在不做了，后接动词的不定式结构。
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