单项选择题

A driver should concentrate ____________ the road when driving.

A．from
B．in
C．on
D．of
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单项选择题
The general director of the project ordered that the work ____________ at once.
A．be started
B．was started
C．would start
D．will be started
单项选择题
The sociologist ____________ that a demotic (大众的，民众的) society would lower the nation's standards.
A．retained
B．contained
C．sustained
D．maintained
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