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
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单项选择题
He tried to convince her ______ his love but failed.
A．of
B．with
C．for
D．from
单项选择题
Some geologists are particularly interested in the layers of ______ surface.
A．the earth's
B．earth's
C．the earth
D．earth
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