单项选择题

She regretted ______ up the plan; otherwise, she would have made it.

A．given
B．to give
C．to have given
D．having given
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单项选择题
Try ______ the green button to see if the machine will start.
A．press
B．to press
C．pressing
D．to have pressed
单项选择题
The professor ______ his habit of getting up early in the morning to do writing all his life.
A．projection
B．retained
C．retailed
D．revitalized
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