单项选择题

The man was so absorbed ______ his job that he didn't notice what was happening.

A．on
B．in
C．of
D．at
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单项选择题
You had better go there by train, ______.
A．don't you
B．won't you
C．hadn't you
D．aren't you
单项选择题
This factory can ______ 10,000 bikes every year.
A．turn out
B．turn up
C．turn in
D．turn over
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