. Being out of order, ______ to the factory.

A．he sent his computer

B．he drove at once

C．his computer was sent

D．his father helped him send it

男性，36岁，因持续性血压升高伴阵发性加剧1年，诊断为嗜铬细胞瘤，行手术治疗。嗜铬细胞瘤切除后第1周血压仍高。下列原因中，可能性最小的是

A．原来体内储存的儿茶酚胺较多

B．手术后的应激状态

C．合并原发性高血压

D．血容量的变化