单项选择题

A．until
B．by
C．to
D．at
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单项选择题
The Russian official’s visit to China aims at______.
A．strengthening security cooperation
B．expanding into Central and Eastern Europe
C．discussing border issues
D．reaching a bilateral agreement in economy
单项选择题
The peace talks between rebels and the Zairian government______.
A．have been cancelled
B．are put to a later time
C．took place according to schedule
D．took place ahead of schedule
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