---May I use your dictionary?

---_____.

A．Never mind

B．You are welcome

C．It doesn’t matter

D．Certainly. Here you are

导致风湿性二尖瓣狭窄患者死亡的最常见并发症是

A．脑血栓

B．心房纤颤

C．充血性心力衰竭

D．亚急性感染性心内膜炎

E．急性肺水肿