When I got into the classroom I found a book on the floor.A. lyingB. liesC. lieD. lied

问题补充：

When I got into the classroom, I found a book on the floor.

A. lying

B. lies

C. lie

D. lied

答案：

(答案→)A. lying

B. lies

C. lie

D. lied

解析：动名词做宾语补足语，这里的意思是当我进入教室时，发现书正在地面上。从句子意思上来看也应该用进行时。