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
Facial tattooing is a standard ______ among certain peoples.
A．custom
B．habit
C．practice
D．tradition
单项选择题
The shower ______ over, we went on with our journey.
A．was
B．being
C．to be
D．been
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