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
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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
单项选择题
The White House and other federal buildings were ______ as a plane enters the restricted airspace.
A．vacated
B．empty
C．deserted
D．evacuated
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