可接受的答案
- 恐怖分子袭击了美国
- 恐怖分子劫持了两架飞机，撞向纽约市的世界贸易中心
- 恐怖分子劫持了一架飞机，撞向弗吉尼亚州阿灵顿的五角大楼
- 恐怖分子劫持了一架原本飞向华盛顿特区的飞机，坠毁在宾夕法尼亚州的一片田野
英文
What major event happened on September 11, 2001 in the United States?
- Terrorists attacked the United States
- Terrorists took over two planes and crashed them into the World Trade Center in New York City
- Terrorists took over a plane and crashed into the Pentagon in Arlington, Virginia
- Terrorists took over a plane originally aimed at Washington, D.C., and crashed in a field in Pennsylvania
提示（英文）: The question refers to the terrorist attacks of September 11, 2001.
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