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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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
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
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