A. why
Giải thích:
Trạng từ quan hệ:
Ta dùng trạng từ quan hệ ‘when’ để thay cho cụm trạng ngữ chỉ thời gian ‘in the 1960s’.
Tạm dịch: An important achievement behind the online travel experience dates back to the 1960s when the first global distribution system (GDS) was introduced. (Thành tựu quan trọng đằng sau trải nghiệm du lịch trực tuyến có từ những năm 1960 khi hệ thống phân phối toàn cầu đầu tiên (GDS) được giới thiệu.)
→ Chọn đáp án C
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