单项选择题

A．espoused
B．postulated
C．deemed
D．speculated
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单项选择题
What is the purpose of the buddy system
A．To save money on equipment.
B．To instruct newcomers to learn bicycle maintenance.
C．To ensure that everyone knows about the historical sites.
D．To help keep participants from getting lost.
单项选择题
A．wereB．isC．wasD．be
A．were
B．is
C．was
D．be
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