单项选择题

You can’t afford to let the situation get worse. You must take _________to put it right.

A．decisions
B．directions
C．sides
D．steps
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单项选择题
To improve efficiency the factory______ most of its workers with robots.
A．operated
B．replaced
C．contributed
D．accomplished
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
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