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

Tom ought not to （） me your secret, but he really meant no harm.

A．have told
B．tell
C．be telling
D．having told

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