单项选择题

Without the sun's light（）the earth's surface, it would be so cold that life could not exist on the earth.

A．warms
B．warmed
C．warming
D．to warm

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单项选择题
Once environmental damage（）, it takes many years for the system to recover.

A．had done
B．is done
C．is to do
D．does
单项选择题
The law requires that everyone（）his car checked at least once a year.

A．has
B．had
C．have
D．must have
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