Giving credit where credit is due will not only ingratiate (讨……欢心) you with your helper, but it will impress the bosses into considering you for future promotion.

【参考答案】

该感谢谁就明着感谢谁，这样做不仅讨了帮助过你的人的欢心，也会给老板留下印象，促其考虑升你的职。