男，65岁，胸痛8小时，心电图下壁导联和右胸导联ST段抬高0.1～0.3mV，经过补液治疗，血压仍然偏低，考虑血压低的原因（）

A.心源性休克

B.慢性心力衰竭

C.输液过多过快

D.急性右室梗死

E.血容量不足

He _______ have completed his work；otherwise, he wouldn’t be enjoying himself by the seaside.

A．should

B．must

C．wouldn’t

D．can’t