单项选择题

Was it is 1969 ______ the American astronaut succeeded ______ landing on the moon

A．when, on
B．that, on
C．where, in
D．that, in
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单项选择题
Life was very difficult for them because of the desert climate. Yet their lives were rich ______ art.
A．with
B．for
C．in
D．without
单项选择题
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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