风湿性心脏病最常累及的瓣膜是：()

A．二尖瓣

B．三尖瓣

C．肺动脉瓣

D．主动脉瓣

E．二尖瓣和肺动脉瓣

I didn’t know his address yesterday, otherwise I __________ him a visit.

A．would pay

B．would have paid

C．paid

D．had paid