He told you that he had already had a new bike, ?
A:did he
B:didn't he
C:had he
D:hadn't he
下列关于新中国成立到20世纪70年代中美关系发展历程的概括,较为准确的是( )
若▱ABCD的周长是40cm,△ABC的周长是27cm,则AC的长为( )