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

The houses are made of stone. Houses so ______ are much expensive.

A．constructing
B．constructed
C．construct
D．to construct

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

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