Answer: D) Past perfect continuous.
Explanation for this question is being written.
Answer: C) Had been working.
Answer: C) Hadn't been sleeping.
Answer: B) Had been crying.
Answer: A) Been watching.
Answer: B) Let-had been standing.
Answer: B) False
Answer: A) I hadn't been studying for the test when my mom called.
Answer: C) Had been crying.
Answer: B) Past perfect continuous.
Answer: C) Had-had graduated.
Answer: D) Had been walking.
Answer: B) Hadn't been paying.
Answer: D) Had been working.
Answer: C) Had been cooking.
Answer: D) Hadn't been watching.
Answer: A) First he worked, then he felt tired.
Answer: A) Had been.
Answer: A) Had been playing.
Answer: B) Had been studying.
Answer: A) Had been waiting.
Answer: D) They'd been playing football.
Answer: C) Past Perfect Continuous Tense.
Answer: C) Had been overeating.
Answer: B) Had been living.
Answer: C) Had + been.
Answer: B) Had been.
Answer: B) Had been waiting.
Answer: C) Past perfect continuous tense.
Answer: C) He had been fixing the car.
Answer: D) They had been playing football.
Answer: A) Had been living.
Answer: B) Had been playing.
Answer: A) Hadn't been getting.
Answer: C) Had been waiting.
Answer: B) Had been jogging.
Answer: A) Had been sleeping.
Answer: A) Had been using.
Answer: C) Past perfect progressive.
Answer: C) Had been reading.
Answer: A) Had been running, stopped.
Answer: C) They had been studying for three hours before they took a break.
Answer: D) Had they been driving for a long time?
Answer: C) Had known / would never have taken.
Answer: D) Had been climbing.
Answer: A) Correct
Answer: C) Had been sold.
Answer: D) Past perfect progressive.
Answer: A) Had she been searching.
Answer: A) Had been looking.
Answer: A) Had been working.
Answer: A) Had been skating.
Answer: C) To show that an action was ongoing in the past before another past action.