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
Ants food for the winter.
A．take up
B．put up
C．hold up
D．store up
单项选择题
A．familiarityB．acquaintanceC．knowledgeD．skill
A．familiarity
B．acquaintance
C．knowledge
D．skill
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