"Complete the sentence with the correct option considering what you learned in lesson 8 - Narrative Tenses."
They both thought that a teenager ______ rock music nect door.
a. had been playing
b. had played
c. was playing
The correct option to complete the sentence is:
c. was playing
So the complete sentence would be: "They both thought that a teenager was playing rock music next door."
This choice uses the past continuous tense, which is appropriate here to indicate an ongoing action in the past.