单项选择题

Peter had difficulty swimming across the lake, but he finally succeeded on his fourth ______.

A．attempt
B．process
C．display
D．instance
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单项选择题
When people ask him for help, he never turned his back ______ them.
A．with
B．off
C．from
D．on
单项选择题
He tried to convince her ______ his love but failed.
A．of
B．with
C．for
D．from
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