Take a look at the sentence again:
Sherry should have __________ everyone the truth. Then poor Rebecca would
have declined a bowl of soup instead of vomiting in the bathroom once she
learned the recipe included half a cup of frog tongues.
The sentence requires the past participle of tell, an irregular verb. Told is the past participle form.
| Verb | Simple Present | Simple Past | Past Participle |
| tell | tell(s) | told | told |
Telled, the form you chose, is a spelling error. Before you continue, review the rules for irregular verbs.
Try again to escape Grammar Hell!