问题
选择题
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
答案
A
not speak与to stay at his own machine，keep his eyes on his screen是并列关系，形式应一致。故选A。