单项选择题

The introduction of a computer into the production line has raised the output more than if one hundred more trained workers （） put on the job.

A. had been
B. were
C. be
D. would be

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The thief was a good runner, so he （） escape from the police.

A. could
B. was able to
C. might
D. should
单项选择题
I am not a diplomat now, but I （）.

A. used to
B. was used to
C. used to being
D. used to be
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