单项选择题

Only after the invention of computers, ______ a step further.

A．did the process of automation go
B．the process of automation went
C．so the process of automation
D．went the process of automation
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单项选择题
______ such a beautiful city like this one.
A．Never in my life I have seen
B．Never in my life have I seen
C．Never in my life I saw
D．Never in my life saw I
单项选择题
What is he He is ______.
A．a teacher and writer
B．a teacher and a writer
C．teacher and writer
D．the teacher and writer
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