I really wonder____ he has posted me many parcels_____ we didn't work together.

A．how ,after

B．why, when

C．when, before

D．why, since

下列佝偻病极期骨骼X线改变，错误的是（）

A.骨骺软骨增宽

B.骨干弯曲

C.骨质疏松

D.干骺端临时钙化带模糊

E.骨骺与干骺端的距离增大