Answer: A) He had been studying for hours.
Explanation for this question is being written.
Answer: A) Past perfect continuous.
Answer: D) Past perfect continous.
Answer: D) Had been waiting.
Answer: B) How long.
Answer: A) Past Perfect = result, Past Perfect Continuous = duration.
Answer: C) Had been attending.
Answer: A) Had been driving.
Answer: D) Had been running.
Answer: C) Had had.
Answer: D) Past perfect continuous.
Answer: A) Must have been stolen-was waiting.
Answer: B) Had been working.
Answer: B) Had been trying.
Answer: D) Had been flying.
Answer: C) Had been watching / would have been talking.
Answer: C) Had been playing.
Answer: D) They had been waiting for an hour before the bus arrived.
Answer: C) Past perfect progressive.
Answer: A) Had been falling.
Answer: A) Past
Answer: C) Had been working.
Answer: A) Had
Answer: C) Had she been talking.
Answer: C) Abandoned
Answer: B) Had been.
Answer: C) Had been studying.
Answer: A) Hadn't been running.
Answer: A) Had been looking for.
Answer: B) Had been taking.
Answer: C) Had been.
Answer: A) Had been waiting.
Answer: A) Had + been + verb-ing.
Answer: D) Had been copying.
Answer: A) No
Answer: B) Past Perfect Continuous Tense.
Answer: B) Had he been walking.
Answer: A) He WOULD HAVE BEEN studyING for two hours.
Answer: A) Krishal had been driving a car.
Answer: C) Had + been + verb-ing.
Answer: B) Had been sleeping.
Answer: A) Won; had been practicing.
Answer: B) Had been texting.
Answer: A) They had been playing chess.
Answer: A) Past perfect continuous tense.
Answer: B) Past Perfect Continuous.
Answer: C) I had been finding.
Answer: A) Subject + had not been + verb(-ing).
Answer: B) Had been living.
Answer: C) Was, had been working.
Answer: C) Past perfect continuous.
Answer: B) Had been planning.
Answer: C) Had been standing.
Answer: B) He had been working on it for three days.