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
A person''s calorie requirements vary______ his life.
A．across
B．throughout
C．over
D．within
单项选择题
After a few rounds of talks, both sides regarded the territory dispute______.
A．being settled
B．to be settled
C．.had settled
D．as settled
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