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
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
A