People believed that Jane retired because of her poor health.
A. Jane is believed to have retired because of her poor health.
B. Jane was believed to have retired because of her poor health.
C. It is believed that Jane retired because of her poor health.
D. Jane retired because of her poor health was believed.
Đáp án B
Câu ban đầu: Mọi người đã tin rằng Jane nghỉ hưu bởi vì sức khỏe yếu của mình.
Câu này đang ở thì quá khứ đơn nên ta loại luôn đáp án A và C (sai thì).
Đáp án D sai ngữ pháp.
Ta chọn đáp án B theo đúng cấu trúc dạng bị động.
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