Discussion is：（ ） A: An exchange of opinion. B: Chit chat. C: A waste of time. D: A debate.
Discussion is：（ ） A: An exchange of opinion. B: Chit chat. C: A waste of time. D: A debate.
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Discussion is：（ ） A: An exchange of opinion. B: Chit chat. C: A waste of time. D: A debate.