单项选择题

______, he doesn't always learn what he should do.

A．How a man ever so clever
B．A man is ever so clever
C．So clever as is a mail
D．No matter how clever a man is
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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
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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