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
I ______ with thanks the help of my colleagues in the preparation of this new column.
A．express
B．confess
C．verify
D．acknowledge
单项选择题
The manager gave one of the salesgirls an accusing look for her ______ attitude toward customers.
A．impartial
B．mild
C．hostile
D．opposing
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