单项选择题

The government ______ regulations that put this old city under protection.

A．published
B．issued
C．discharged
D．released
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单项选择题
The government is trying to do something to ______ better understanding between the two countries.
A．raise
B．promote
C．heighten
D．increase
单项选择题
The last half of the nineteenth century ______ the steady improvement in the means of travel.
A．has witnessed
B．was witnessed
C．witnessed
D．is witnessed
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