What major event happened on September 11, 2001 in the United States?

接受的答案

1. Terrorists attacked the United States
2. Terrorists took over two planes and crashed them into the World Trade Center in New York City
3. Terrorists took over a plane and crashed into the Pentagon in Arlington, Virginia
4. Terrorists took over a plane originally aimed at Washington, D.C., and crashed in a field in Pennsylvania

来源: USCIS 2025 Civics Test (M-1778 (09/25))

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