— John seems happy, even though his wife left him and he lost his job.

— I think he __________ to put on a brave face.

A．will try

B．has tried

C．had tried

D．is trying

二尖瓣狭窄可见( )

A．咳嗽伴咯血
B．咳嗽伴杵状指
C．咳嗽伴哮鸣音
D．咳嗽伴大量脓痰
E．咳嗽伴双肺底水泡音