Respuesta :
The sentence that contains an adverb clause is D. The farmer hummed when he listened to music.
An adverb clause simply means a group of words that plays the role of an adverb in a sentence. Such a clause modifies verbs and adjectives.
Based on the information given, the sentence that contains an adverb clause is that the farmer hummed when he listened to music. This contains the subject and a predicate.
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