The patient could not be saved unless there ________ a suitable organ donor.
Đáp án C.
Dựa vào động từ could not be ở vế chính à Đây là câu điều kiện loại 2 nên chọn C. were là phù hợp.
Tạm dịch: bệnh nhân này không thể được cứu sống nếu như không có người hiến tạng phù hợp.
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