摘要：8． they visited the Science Museum.they showed great interest in everything they saw. A．The first time B．For the first time C．At first D．At the first time
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________they visited the Science Museum，they showed great interest in everything they saw.
[ ]
A．The first time
B．For the first time
C．At first
D．At the first time
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B．For the first time
C．At first
D．At the first time