— ____ he be at home now ?

— No . he ____ not . He ____ be in his office . He often goes home from work at almost twelve .

A．Can ; can ; must

B．Must ; need ; can

C．May ; must ; must

D．May ; need ; must

患者男性，46岁。在连续硬膜外阻滞下行胆囊切除术，麻醉效果好，ECG示心率70次/分。术中手术医生突然说“血色发暗”。

下列哪项是首要的处理措施（）

A.面罩给氧辅助/控制呼吸

B.胸外心脏按压

C.静注麻黄碱

D.加快输液

E.气管内插管