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Once environmental damage ______, it takes many years for the system to recover.

A．has done
B．is to do
C．does
D．is done
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Mike's father as well as his mother insisted that he ______ home.
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Was it is 1969 ______ the American astronaut succeeded ______ landing on the moon
A．when, on
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Is this the restaurant ______
A．which you work
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