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
It's no good ______ him. He is always indifferent towards other's matters.
A．to turn to
B．turning to
C．turn to
D．turned to
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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