If you bemoansomething, you are satisfied with it.
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If you rake over something, you want to keep talking about it.
A. 对
B. 错
If you reciprocate, you respond to someone by doing the same thing.
A. 对
B. 错
The rules of etiquette are legal requirements.
A. 对
B. 错
An expletive is an expression of thanks.
A. 对
B. 错
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