People should send their complaints to the head office.
Đáp án đúng là: A. Complaints should be sent to the head office.
Giải thích:
Câu gốc sử dụng động từ khuyết thiếu 'should'. Khi chuyển sang câu bị động, ta dùng cấu trúc 'should be + V3/ed'. Tân ngữ 'their complaints' trở thành chủ ngữ của câu bị động.
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