Henry always forgets things he has done. Yesterday he forgot__________ and looked for it everywhere.

A．to post the letter

B．to have the letter posted

C．to have posted the letter

D．having posted the letter

患者，女，8岁，半个月前出现注意力不集中，字迹歪斜，伴肩、膝关节酸痛。查体：面部挤眉、噘嘴动作增多，伸舌不停地扭转和伸缩，双上肢各关节交替伸屈、内收，四肢肌张力低，腱反射减弱，无锥体束损害体征。该病的病因治疗是

A．地西泮

B．青霉素

C．安定合并泼尼松

D．青霉素和泼尼松

E．水杨酸钠和泼尼松