Answer:
a conjunction that introduces a subordinate clause, e.g., although, because.
Explanation:
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Examples: Some examples of such subordinating conjunctions are once, while, when, whenever, where, wherever, before, and after. Once Batman learned that Robin had not been wearing his seatbelt, he took away his keys to the Batmobile. Robin looked regretfully at the Batmobile whenever he passed it in the Bat cave.
