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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单项选择题
After a whole day's heavy work, the old worker returned home, ______.
A．hungry and felt exhausting
B．hunger and exhausted
C．hungry and exhausted
D．hungry and having been exhausted
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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