We sang and .
A:Danced
B:dance
C:Dancing
① The book is mine. ____ A. It's Mike's book.
② The book is Amy's. ____ B. The book is theirs.
③ It's their book. ____ C. Its' Amy's book.
④ The book is Mike's. ____ D. It's my book.
据图分析,下列叙述错误的是( )