Which sentence contains an adverb clause? a. there was a meteor shower last evening just after midnight. b. you should mark your calendar for the family picnic next month. c. when do the tryouts for the dance team begin? d. i did not remember that fact until my older sister reminded me.

D. I did not remember that fact until my older sister reminded me.

Among the sentences presented, this is the sentence that contains an adverb clause, "I did not remember that fact until my older sister reminded me." The adverb clause in this sentence is "until my older sister reminded me". An adverb clause is simply a part of the sentence that contains a subject and a verb with a subordinate conjunction. The subordinate conjunction do not allow the clause to have a complete meaning. An adverb clause also answers to the question how, when, where and why. In this case, the adverb clause answers to the question "how".