Answer:
C) used to spend
Explanation:
if you read the sentence with the other answers it does not make sense. This is proper grammar and tense.
<em>hope this helps! :)</em>
Active voice is when the subject performs the verb. The answer is 'Our puppies played at the cool new dog park' because the puppies are playing, while the rest of the verbs in the other choices are not being acted at by the subject.
It's probably too late but the answer would've been "A" i'm pretty sure