"bInaypa', loDnallI' Daghom'a'?"
Translation:Before you got married, did you meet your husband?
There are two possible senses here.
"Before you marry Person X, will you meet Person X (who is to be your husband)?"
"Before you marry Person X, will you meet Person Y (who is your current husband)?"
The latter can come up in cases of divorce. It would explain the use of ghom instead of qIH (though I suspect the actual reason is that qIH isn't part of the Duolingo vocabulary).
As for the former, I'd point out that TKD defines nay as marry (wife does this) and Saw as marry (husband does this).* Question: if one is in the process of nay, then one isn't a wife yet... so how does it apply? A wife doesn't nay, a person who is about to become a wife does nay. Likewise with Saw.
The answer is, of course, that we can mentally fill in the details. nay could be more accurately defined as marry (the one who is to become the wife does this) and similarly for Saw.
The same thing applies to the sentence. Before you marry [hasn't happened yet], will you meet your husband [-to-be]?
Your response is better than the official one, because it correctly takes into account the aspect of the Klingon sentence. Got married and did you meet are completed actions.
The English would be better translated into Klingon as bInaypu'pa', loDnallI' Daghompu''a'? Or even better, bInaypu'pa', loDnallI' DaqIHpu''a'?