________ he driven more carefully, the accident would not have happened the other day.

A．Be

B．Had

C．Has

D．Would have

患者女性，49岁。巨大腹内肿瘤，搬动和摘除巨大肿瘤后最不容易发生的是（）

A.血压升高

B.血压不变

C.血压轻微下降

D.血压中度下降

E.休克