When he came back, he found all the things ______.

When he came back, he found all the things ______.
A、turned out
B、turned down
C、turned over
D、turned in
【正确答案】：C
【题目解析】：turn out 结果是；turn down 减小； turn over 翻阅；turn in 交上； 句意：当他回来时，他发现所有的东西都被______了。C 符合题意，被翻阅了。