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 extensive survey suggested that their assumptions ______totally wrong.
A．were
B．be
C．was
D．would be
单项选择题
We''ll visit Europe next year ______ we have enough money.
A．lest
B．until
C．unless
D．provided
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