问题补充:
单选题WhenIreturnedtomystudy,Ifoundthefloorthoroughly______andallmybooks______accordingtothetypesofbooksA.changing; rangingB.changed; rangingC.have changed; rangedD.has changed; ranged
答案:
B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。