下列哪种病变的杂音为全收缩期杂音

A．二尖瓣狭窄

B．二尖瓣关闭不全

C．主动脉瓣狭窄

D．肺动脉瓣狭窄

E．动脉导管未闭

___________ the past, leaving the sadness behind, ___________ you’ll see the door of a new bright world open before you.

A．Forget; and

B．Forgetting; and

C．Forget; /

D．To forgetting; /