Fill in the blank with the most appropriate word.
"Did you work at a factory 3 years ago?" she asked her friend. She asked her friend if she ________.
The two ways of relating what a person has said are 1)direct and 2)indirect (reported speech).In direct speech, the original speaker's exact words are repeated. In indirect/reported speech, the exact meaning is expressed but not necessarily using the original speaker's exact words. Pronouns and possessive adjectives usually change from first or second person to the third person except when the speaker is reporting his own words. Sometimes a noun can be inserted to avoid doubt.
When we turn direct questions and exclamations into indirect speech, they are converted to affirmative statement .( ? and ! is not used).
Option B is correct as when we convert the given direct question to indirect speech if is used as the question doesn't begin with a question word, asked is used as the introductory verb,the simple past tense is changed to past perfect and ago is changed to before.
The other options are wrong as worked, really, work can't be used, and before is not used.
The correct answer is B)had worked at a factory 3 years before.