单项选择题

Except on official ______ Such as formal receptions, American society has a certain amount of informality.

A．cases
B．situations
C．events
D．occasions
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单项选择题
This is the ______ to an improvement of their living conditions.
A．key
B．decision
C．essence
D．alternative
单项选择题
She once again went through her composition carefully to ______ all spelling mistakes from it.
A．eliminate
B．withdraw
C．diminish
D．delete
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