问题
选择题
________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
答案
答案：A
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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
答案：A