单项选择题

What was the most wonderful piece of machinery on show

A．The steam boat.
B．The steam engine.
C．The steam hammer.
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单项选择题
A．They should start leaving the exhibition hall now.B．No more visitors will come.C．The exhibition is still open.
A．They should start leaving the exhibition hall now.
B．No more visitors will come.
C．The exhibition is still open.
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years→year
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