Although Valentine's Day has become a global industry with more than 80 million roses sold worldwide, the origins of the day are unclear and hidden in the mists of time.
A. bắt nguồn từ người cổ đại
B. đủ mới để bất kỳ ai cũng có thể xác nhận
C. vẫn là một bí ẩn đối với mọi người
D. từ rất lâu và không thể quên
lost/hidden in the mists of time: bị lãng quên (vì đã rất lâu) >< new enough for anyone to confirm
Tạm dịch: Mặc dù ngày Lễ tình nhân đã trở thành một ngành công nghiệp toàn cầu với hơn 80 triệu hoa hồng được bán khắp thế giới, nguồn gốc của ngày này vẫn không rõ ràng và là một bí ẩn.
→ Chọn đáp án B
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