单项选择题

Ever since Picasso's painting went on exhibition, there ______ large crowds at the museum every day.

A．is
B．has been
C．have been
D．are being
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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
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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