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
The British constitution is ______ a large extent a product of the historical events described above.
A．within
B．to
C．by
D．at
单项选择题
The manager would rather his daughter ______ in the same office.
A．had not worked
B．not to work
C．does not work
D．did not work
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