What conceals or hides the door to their annexe?

A bookcase

Explanation:

If you're asking about what concealed the door to the secret annex that Anne Frank and her family took hiding in, then there's your answer. If you're referring to something else, then I'm not sure what you mean.

alaska is the answer to this

hello!

according to the passage the most suitable options are two. the first one is "by leading the aef to victory in several key battles" like the battle of saint- mihiel and the battle of cantigny mentioned in the passage you copied here. the second one is "by the aef and allied forces defeat germany" since the passage says that his army destroy the german resistance in the meuse- argonne offensive. and also, "by insisting that the aef operate as an independent force".

hope this