Answer: D) Had shown.
Explanation for this question is being written.
Answer: A) Had already left.
Answer: C) Had been.
Answer: C) S + had+ v3 + o + adv.
Answer: C) He had never tasted sushi before he visited Japan.
Answer: A) Had read.
Answer: A) Had designed.
Answer: A) Had built.
Answer: B) Had finished, was.
Answer: A) Had taken.
Answer: C) Had left.
Answer: A) Past
Answer: A) Had changed.
Answer: A) True
Answer: C) Had entered.
Answer: A) Had already worked.
Answer: B) Had started.
Answer: A) Had
Answer: C) Had invited.
Answer: B) Suj + aux had + verb past + complet.
Answer: C) He had finished his work before the meeting started.
Answer: A) Had worked.
Answer: B) Had helped.
Answer: A) Had worked, came.
Answer: D) They had played soccer.
Answer: A) Had never been / was.
Answer: B) Had read-started.
Answer: A) Had composed.
Answer: C) Had testified.
Answer: A) Had done.
Answer: A) Baked
Answer: D) Had gone.
Answer: A) Had forgotten.
Answer: B) Had
Answer: A) Had left.
Answer: B) Had never seen.
Answer: D) Had already been deleted.
Answer: D) Had been.
Answer: C) Had stopped.
Answer: A) Past Perfect Tense.
Answer: C) Had already left.
Answer: A) Had spoken.
Answer: A) Had won.
Answer: B) Had published.
Answer: A) Had cleaned.
Answer: D) Had visited.
Answer: C) Had run.
Answer: A) He had finished his meal before the guests arrived.
Answer: A) Had watched.
Answer: A) Finished
Answer: D) Had fled.
Answer: C) Had found.
Answer: A) The noise had troubled the people.
Answer: C) Past perfect tense.
Answer: D) Had passed.
Answer: E) Past perfect.
Answer: A) Had taught, gave.