单项选择题

Our country has ______ diplomatic relation with many countries in the world.

A．set
B．settled
C．fixed
D．established
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单项选择题
I don't think it's wise of you to ______ your greater knowledge in front of the director, for it may offend him.
A．show up
B．show out
C．show in
D．show off
单项选择题
The speech ______, a lively discussion started.
A．being delivered
B．was delivered
C．be delivered
D．having been delivered
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