单项选择题

Do it now,（）it will be too late.

A、 for
B、 and
C、 or
D、 before

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单项选择题
Workers had to work under terrible（）in the preliberation days.

A、 situation
B、 conditions
C、 circumstances
D、 environment
单项选择题
I regret（）harder at office.

A、 not to have worked
B、 not having worked
C、 not have worked
D、 having not worked
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