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
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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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