单项选择题

Four hours（）the limit of this driving test,

A．are
B．has been
C．will be
D．is

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单项选择题
Do it now,（）it will be too late.

A．for
B．and
C．or
D．before
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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