By the end of the 21st century, international commercial air traffic is expected ______ vastly beyond today’s levels.
A、to have extended ;
B、to be extending;
C、 to extend;
D、to be extended
发布时间：2025-06-09 02:52:11
请在 下方输入 要搜索的题目：
推荐参考答案 (
由 快搜搜题库 官方老师解答 )
答案：to have extended
相关试题
- 1.By the end of the 21st century, international commercial air traffic is expected ______ vastly beyond
- 2._______the turn of the 21st century
- 3.The barrier to democracy in 21st century America is ________.
- 4.名词解释：The 21st Century Maritime Silk Road
- 5.air traffic
- 6.At the end of the 19th century, women’s suffrage was first achieved not in Britain but in ______.
- 7.What are the three stages of smart tourism in 21st century?
- 8.air traffic congestion ()
- 9.air traffic control
- 10.air traffic control
