男性，70岁。慢性支气管炎及阻塞性肺气肿病史30余年，近1年来反复双下肢水肿。1周来咳嗽、咳痰加重，口唇发绀、神志恍惚。查体：双中下肺闻及干湿啰音，心率130次／分，可闻及期前收缩。

诊断患者肺心病的必备条件是（）.

A.呼吸衰竭

B.重度肺气肿

C.肺动脉高压

D.重度阻塞性通气功能障碍

E.双下肢水肿

_____ has recently been done to provide more buses for the people, a shortage of public vehicles remains

a serious problem. [ ]

A. That

B. What

C. Despite what

D. Though what