At the puter 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
网友回答
(答案→)A. and not to speak
B. but could not speak
C. instead of speaking
D. or rather speak
解析：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。