问题
选择题
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
答案
答案：B
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。