Expect it to be missing in other places as well. You are welcome to report them. I will add it here.
Oh, sorry, I somehow missed it is a question here. We do not have the affirmative word order here (yet) and I am not sure we should have. We do have the past simple tense already.
EDIT: I added it and many related forms. We also had some affirmative order sentences already.
How does one know this is a question? It does not sound like one in the oral. I'm having this issue with a lot of the exercises. The way Duolingo presents it, Czech does not seem to make questions clear with word order like English (usually) does, i.e. by starting questions with a verb or an interrogation word such as kdo. Thanks.