The boy told us______.    [ ]

A.  that he has collected 200 stamps    

B.  that he had collected 200 stamps    

C.  if he has collected 200 stamps    

D.  if he had collected 200 stamps    

双杠分腿坐前进中，两腿并腿前摆时以（）为轴

A、肩

B、腰部

C、两臂

D、髋关节