单项选择题

The United Nations was ______ forty years ago and held a special conference in November 1985 to celebrate.

A．established
B．set
C．completed
D．settled
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单项选择题
Because of iii health, she has been obliged to ______. her job.
A．resign
B．retire
C．sack
D．depart
单项选择题
One of the water ______ has burst and the kitchen is full of water.
A．tubes
B．pipes
C．conductors
D．channels
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