Answer: B) Had opened.
Explanation for this question is being written.
Answer: B) Had not been invented.
Answer: B) Past Perfect.
Answer: B) Had cleaned.
Answer: C) Had read.
Answer: B) Had done.
Answer: C) Had already left.
Answer: B) Had worked.
Answer: C) Had finished.
Answer: B) Had influenced.
Answer: A) Past Perfect.
Answer: B) Had written.
Answer: B) Had known.
Answer: B) B
Answer: C) Had opened.
Answer: B) Had already been given.
Answer: B) Had gone.
Answer: C) Had had.
Answer: B) Had
Answer: B) Had completed.
Answer: A) Had heard.
Answer: C) Had studied.
Answer: C) Had buckled.
Answer: C) Had worked.
Answer: A) Past perfect tense.
Answer: D) Had finished.
Answer: C) C
Answer: B) Past perfect.
Answer: C) Had been born.
Answer: C) Had managed.
Answer: B) Had started.
Answer: B) Had / finished.
Answer: C) Had
Answer: C) Had not finished.
Answer: B) Knew / had broken / offered.
Answer: C) Had seen.
Answer: B) Had taped.
Answer: D) Had checked.
Answer: A) Had had.
Answer: B) You had annoyed.
Answer: C) Past Perfect.
Answer: A) Had / had.
Answer: A) Had left.
Answer: B) Had already done.
Answer: D) Had asked.
Answer: B) Had finished.
Answer: A) Had watched.
Answer: A) Past Perfect Tense.
Answer: B) Had understood.
Answer: C) Had left.
Answer: A) Had read.
Answer: B) Had seen.
Answer: B) Had taken.
Answer: B) Had ordered.
Answer: A) PastPerfect
Answer: A) Had missed.
Answer: B) Had been painted.
Answer: C) Had forgotten.