John received an invitation to dinner, and with his work________,he gladly accepted it.        [ ]

A. finished                   

B. finishing

C. having finished              

D. was finished

急性持续性腹痛，阵发性加剧伴休克，最大可能是

A．机械性肠梗阻

B．绞窄性肠梗阻

C．急性阑尾炎

D．胆道蛔虫症

E．胆石症