单项选择题

It is recognized by more and more people that each man and woman （） the same lights.

A．has
B．have
C．had
D．is having

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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

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

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