Answer: B) Had finished.
Explanation for this question is being written.
Answer: C) Past Perfect.
Answer: D) Had lain.
Answer: B) I'd had it.
Answer: A) Had read, took.
Answer: C) Had seen.
Answer: B) Past Perfect.
Answer: B) She had sung a beautiful song before the guests arrived.
Answer: A) Had thrown.
Answer: B) Had grown apart.
Answer: A) Had decided.
Answer: D) Had been.
Answer: B) Past perfect tense.
Answer: A) Had left.
Answer: D) How he had prepared.
Answer: A) Had
Answer: A) Had failed.
Answer: B) When we came to the station the train had already gone.
Answer: B) Had already performed.
Answer: A) PAST PERFECT SIMPLE.
Answer: B) They had built.
Answer: A) Had already eaten.
Answer: A) Had sent.
Answer: A) Had decorated.
Answer: C) Had caught.
Answer: B) Had run.
Answer: B) He'd donated all the money last year.
Answer: C) Had eaten.
Answer: B) Had already eaten.
Answer: D) Had undergone.
Answer: A) Left
Answer: A) Had known.
Answer: A) Had been involved in.
Answer: B) Had built.
Answer: A) Had completed.
Answer: C) Had left.
Answer: A) Had been.
Answer: C) Past perfect tense.
Answer: B) Had
Answer: B) Past perfect.
Answer: A) Had gone out.
Answer: C) Hadn't come.
Answer: A) Had begun.
Answer: C) Had finished.
Answer: B) Had seen.
Answer: A) Got-had worked.
Answer: C) Have smelt.
Answer: B) Had never heard.
Answer: B) Had dramatically changed.
Answer: C) Had escaped.
Answer: B) Had started.
Answer: D) Had done.
Answer: A) Past Perfect.
Answer: C) Had hiked.
Answer: A) Had been served.
Answer: A) Got-had left.
Answer: C) Had met.