单项选择题

Criticism and self-criticism is necessary ______ it helps us to find and correct our mistakes.

A．by that
B．at that
C．on that
D．in that
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单项选择题
The government is trying to do something to ______ better understanding between the two countries.
A．raise
B．promote
C．heighten
D．increase
单项选择题
Of course we cannot rule ______ the possibility of failure.
A．off
B．out
C．over
D．against
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