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
I regret（）harder at office.

A．not to have worked
B．not having worked
C．not have worked
D．having not worked
单项选择题
（）twice, the old man was dying fast

A．Having been wounded
B．Wounded
C．Being wounded
D．Having wounded
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