单项选择题

All our attempts to ______ the child from drowning were in vain.

A．regain
B．recover
C．reserve
D．rescue
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单项选择题
This is the first draft of the book. Please feel perfectly free to ______ it.
A．deal with
B．comment on
C．cope with
D．dwell on
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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