At the computer operation test, one is supposed to stay at his own machine, keep his eyes on his screen, ______ to anyone.

A．and not to speak

B．but could not speak

C．instead of speaking

D．or rather speak

开户单位因印鉴磨损等原因需要更换预留银行印鉴中的公章、财务专用章或个人名章应如何办理？