Answer: D) Had planned.
Explanation for this question is being written.
Answer: C) Had never been.
Answer: D) Had only been.
Answer: D) Had
Answer: B) Had broken.
Answer: A) Had learnt.
Answer: C) Had, drowned.
Answer: B) Had concluded.
Answer: A) Had graduated.
Answer: A) Had/done
Answer: C) Been
Answer: C) Had eaten.
Answer: C) Had already studied.
Answer: D) D-had seen.
Answer: D) Had contacted.
Answer: D) Had gone.
Answer: C) The correct form is 'I had seen the play last week.'.
Answer: B) Had watched.
Answer: C) Worked
Answer: D) Had taken.
Answer: B) Had fallen.
Answer: B) Had decided.
Answer: A) Had already left.
Answer: B) I'd already seen.
Answer: D) Had sold.
Answer: C) Had seen.
Answer: A) Written
Answer: C) Had
Answer: A) Had rung.
Answer: A) Had eaten.
Answer: B) Had been.
Answer: C) Had been to.
Answer: D) I had forgotten to take the key.
Answer: A) Had taken.
Answer: A) Had left.
Answer: C) They destroyed the bridge which we had crossed.
Answer: A) Had practiced.
Answer: C) Had been.
Answer: C) Had lost.
Answer: C) Completed result.
Answer: B) Past perfect.
Answer: A) Had seen.
Answer: D) Had promised.
Answer: B) Pronoun, had, verb-participle, complement.
Answer: A) A
Answer: D) Had been.
Answer: B) Had grown.
Answer: B) Had / submitted.
Answer: C) She has eaten pizza yesterday.
Answer: C) Had left.
Answer: C) Had forgotten.
Answer: A) Hadn't lost-would have found.
Answer: B) Had already begun.
Answer: C) Had lived.
Answer: A) Had been hidden.
Answer: D) Had started.
Answer: D) She had read the book.