The man _______ over there was injured in a car accident yesterday.

A．operate on

B．being operated on

C．to operate on

D．being operated

患者，女性，43岁，患风湿性心脏病二尖瓣狭窄15年，伴心房颤动1年余，在做家务时突然发生下腹部剧烈绞痛，最可能的诊断为（）。

A.主动脉夹层

B.急性心肌梗死

C.肺动脉栓塞

D.输尿管结石

E.肠系膜动脉栓塞