单项选择题

You should ______ the official channels to get help instead of through private relationship.

A．go after
B．go through
C．go for
D．go out
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单项选择题
These instructions are important, so listen carefully while I ______ them again.
A．Put through
B．go with
C．run over
D．take on
单项选择题
A．ofB．toC．onD．in
A．of
B．to
C．on
D．in
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