单项选择题

If law and order ______ not preserved, people will not be able to live a secure life. ( )

A．are
B．were
C．is
D．was
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单项选择题
There is not much time left for you to cover everything, you'd better ______ unimportant points. ( )
A．leave off
B．focus on
C．leave out
D．concentrate on
单项选择题
To my great surprise the food was still on the table, ______. ( )
A．not to be touched
B．untouched
C．untouching
D．no touch
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