单项选择题

The airplane arrived one hour behind ______.

A．timetable
B．plan
C．date
D．schedule
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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
单项选择题
To succeed in a scientific research project, ______.
A．one needs to be persistent
B．persistence is needed
C．one needs be a persistent person
D．persistence is what one needs
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