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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单项选择题
Going into the office, ______ .
A．a letter was found on the table
B．there was a letter on the table
C．the table had a letter on it
D．he found a letter on the table
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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