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

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

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

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