When I returned to my study, I found the floor thoroughly and all my books according to the types of books
A. changing; ranging
B. changed; ranging
C. have changed; ranged
D. has changed; ranged
网友回答
A. changing; ranging
(答案→)B. changed; ranging
C. have changed; ranged
D. has changed; ranged
解析：本题考查find +宾语+宾补的用法。The floor与clean之间为被动关系，要用过去分词cleaned做宾语补足语；all my books与range为主动关系，要用现在分词ranging做宾语补足语。