单项选择题

I don't think Frank is ______ engineer as Bill.

A．as able an
B．able as an
C．as an able
D．an as able
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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
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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