We must keep the manager (inform) ___________ of the adverti

We must keep the manager informed of the advertising campaign.
keep sb informed of "保持某人被通知/向某人不断报告"的意思.
又如：We shall keep them informed of this matter. 我们应该让他们知道这件事.
We must keep ourselves well informed. 我们要保持消息灵通.

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