Answer: C) Had / been completed.
Explanation for this question is being written.
Answer: C) Had been studying / quit / got.
Answer: B) An action that started in the past and continued up until another time in the past.
Answer: A) Had been reading.
Answer: B) Had been/ died.
Answer: B) They had been arguing before the teacher walked in.
Answer: A) Had been waiting.
Answer: B) Had been designing.
Answer: A) Past Perfect Continuous.
Answer: A) True
Answer: C) Past perfect continuous tense.
Answer: A) Past perfect progressive.
Answer: B) Had been saving.
Answer: A) Had been playing.
Answer: B) Had been playing.
Answer: B) Had been teaching.
Answer: C) Had been preparing.
Answer: A) Had been looking.
Answer: B) Had been snowing.
Answer: C) Had been taking.
Answer: D) She had been preparing her presentation and reviewing her notes.
Answer: A) Had been standing.
Answer: C) Had been running.
Answer: B) Had been sitting.
Answer: A) Had been writing.
Answer: C) Hadn't been cleaned.
Answer: D) Had been waiting.
Answer: C) Had been.
Answer: A) Had been trying.
Answer: B) Had been running.
Answer: C) Had been working.
Answer: C) Had been playing.
Answer: C) Leo was covered in flour because he had been trying to bake cookies all afternoon.
Answer: C) Had been waiting.
Answer: C) Had been closed.
Answer: D) Had forgotten, had been closed.
Answer: A) Had been snowing.
Answer: D) Had been sleeping.
Answer: A) Had been able to update.
Answer: B) Had been skiing.
Answer: C) Had-been working.
Answer: A) It had not been raining today since morning.
Answer: A) Had not been.
Answer: D) Had been watching.
Answer: C) Had already been waiting.
Answer: D) Had been.
Answer: B) False
Answer: B) Had been watching.
Answer: B) Had been driving.
Answer: D) Past perfect continuous tense.
Answer: C) Past Perfect Continuous.
Answer: D) Had you been driving.
Answer: A) He had been sending.
Answer: C) Had been completed.
Answer: B) Hadn't been wearing.
Answer: D) Had been studying.
Answer: E) Was to have been held / was sent.
Answer: C) Hadn't been studying.