参考答案：D

解析： turn out在这里的意思是to happen in a particular way，or to have a particular result, especially one that you did not expect，即“原来是，证明是”，经常表示出乎预料之外的情况。如：That guy turned out to be Maria’s second cousin.(那个人原来是Maria的二表弟。)It was a difficult time，but eventually things turned out all right.(那时候很难，但最终结果还可以。)To my surprise, it turned out that I was wrong.(令我惊奇的是，居然是我错了。)其他三个选项也都是固定词组，turn in意为“拐弯进入，上交”等；turn over意为“翻过来，移交，仔细考虑”等；turn up意为“出现，找到，意外地发生”。