Take another look at the sentence:
While crawling along in rush-hour traffic, Kay cranked up her car stereo and __________ the lyrics to "Back in Black" with AC/DC, oblivious to the scowls of annoyance from the other drivers trapped beside her.
The sentence requires the simple past of sing, an irregular verb. Sang is the simple past form.
|Verb||Simple Present||Simple Past||Past Participle|