—Where is Bruce? Is he at home?

—I think he _____ school. [ ]

A. has gone                          

B. has been  

C. has gone to                        

D. has been to

胆道蛔虫病表现为（）

A．突然上腹部持续性刀割样剧痛，查体为板状腹

B．突然上腹部阵发性钻顶样剧痛，间歇期无痛

C．突然上腹部绞痛，持续性腹痛阵发性加重，向右肩部痛

D．突然上腹部持续性剧烈疼痛，腰背部痛

E．突然一侧腹痛阵发性绞痛，放射至外阴部