男性，38岁，因休克入院。经补液后，血压仍低，中心静脉压不高，5～10分钟内经静脉注入等渗盐水250ml，如血压升高，而中心静脉压不变，提示

A．心功能不全
B．血容量过多
C．血容量不足
D．血管张力过高
E．以上均不是

— Is Bob still performing?

— I'm afraid not. He is said _____ the stage already as he has become an official.

  [ ]

A. to have left

B. to leave

C. to have been left

D. to be left