We need to learn()A how to be polite B what to do it C how to do

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We need to learn()A how to be polite B what to do it C how to do
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We need to learn()A how to be polite B what to do it C how to do
We need to learn()A how to be polite B what to do it C how to do

We need to learn()A how to be polite B what to do it C how to do
A正确.B去掉it就对了.C中do后加it就对了.