The form to submit a comment on this sentence in the course is not working so I have to post directly the forum.
The formatting of the sentence and the clozed word as it appears in the course needs to be fixed. The clozed word is “ag” not “a” and the duplicate “ag obair ag an taigh-osda” needs to be removed.
Also this is a very unnatural translation by Tatoeba user who has authored a number of poor Scottish Gaelic translations. It would be more natural say “sa mhadainn a-màireach” rather than “a-màireach anns a’ mhadainn”.