Answer:
subordinating conjunction
Step-by-step explanation:
The conjunction used in the sentence “Will you wait until I return?” is until.
Conjunctions are words that connect clauses or sentences.
In this case, “until” is a subordinating conjunction that connects the main clause “Will you wait” with the subordinate clause “I return”.
It indicates that the action in the main clause will continue to happen until the action in the subordinate clause happens.
Hope this helps!!!