A:Hi,B,have you seen my book that has many interesting stories?
B:Sorry,but you can ask the boy who read aloud beside you this morning.
C：The boy is in Class 8,as I know.
D（comes in) ：Hello,A ,is the book,on whose cover there is a signature of "Wang ..in Class 7 ,Grade 1",yours I found it on the playground this morning.