单项选择题

To improve efficiency the factory______ most of its workers with robots.

A．operated
B．replaced
C．contributed
D．accomplished
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单项选择题
How these big stones were moved to the mountain tops remains a________, that is, nobody knows how.
A．mystery
B．possibility
C．responsibility
D．faith
单项选择题
Our sports meet is planned to take place_______ Saturday morning.
A．in
B．at
C．on
D．of
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