—Long time no see, David.

—I have            to Shanghai for my vacation.[ ]

A. grown

B. lived

C. been

D. gone

关于主动脉瓣关闭不全患者杂音的传导，正确的是（）

A.向左腋下传导

B.向颈部传导

C.向背部传导

D.向心尖部传导

E.向右胸部传导