______ at by everyone, he was disappointed.
Giải thích
Đáp án: A
Giải thích: Rút gọn mệnh đề trạng ngữ diễn đạt ý nguyên nhân - kết quả.
Laughed at by everyone, he was disappointed. = (Because) he was laughed at by everyone, he was disappointed.
Dịch: Bị mọi người cười nhạo, anh ấy đã rất thất vọng.