Harry, did you attend the dancing party________ at Jack's house the day before yesterday?[ ]

A. held  

B. having been held      

C. to be held    

D. being held

患儿男，3岁，家长偶然发现患儿站立时双肩倾斜前来就诊。

脊柱器质性侧凸的特点是（）。

A.可见于正常人

B.改变体位不能使侧弯得到纠正

C.平卧时可消失

D.向前弯腰时可消失

E.俗称驼背

F.也称非结构性侧凸