Câu trả lời được chấp nhận: 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
On September 11, 2001, terrorists hijacked four airplanes. Two hit the World Trade Center in New York City, one hit the Pentagon in Virginia, and one crashed in Shanksville, Pennsylvania, and almost 3,000 people died. (Study guide, chapter 11.)
Trích tài liệu chính thức: “Terrorists attacked the United States” Nguồn chính thức, đã kiểm tra ngày 14 tháng 10, 2026