rapidly有急速的意思。而quickly强调行动的敏捷。promptly比较少见，暂时不动。
rapidly adv. done or happening very quickly and in a very short time
如： The patient was sent to hospital rapidly.
quickly adv. fast; after only a very short time ; for a short time 使用较常见
promptly adv. 使用较生僻，侧重于“及时的”
如： Your purchases will be delivered promptly .
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