Answer: A) Karen had been learning Spanish for two years when she went to live in Argentina.
Explanation for this question is being written.
Answer: A) Right
Answer: D) Had been studying.
Answer: D) Had been driving.
Answer: A) They had been hiking for miles before they saw the bear.
Answer: D) D
Answer: C) Had been drawing.
Answer: A) Subject + had been + verb (ing) + object.
Answer: B) Had been walking.
Answer: A) Perfect Tenses.
Answer: B) Had been waiting.
Answer: A) Had been.
Answer: A) Had been tested.
Answer: A) Had been working.
Answer: B) Past Perfect Continuous Tense.
Answer: C) Had been waiting.
Answer: C) Had he been working.
Answer: A) True
Answer: B) Had been swimming.
Answer: D) Was / had been waiting.
Answer: A) Had been practicing.
Answer: A) Had been living.
Answer: C) Had been looking for.
Answer: B) Had been living.
Answer: B) No
Answer: B) It was interrupted by another event in the past.
Answer: D) Past perfect continuous tense.
Answer: B) Had-been waiting.
Answer: D) Had been waiting.
Answer: A) Had beenteaching.
Answer: C) Had been playing.
Answer: A) Past Perfect Continuous.
Answer: A) Arrived, had been working.
Answer: C) Had been waiting / caught.
Answer: B) Had been.
Answer: A) Had been snowing.
Answer: B) False
Answer: B) Past perfect progressive.
Answer: D) Had been working.
Answer: A) Had been raining.
Answer: D) Past Perfect Con.
Answer: A) Had been looking.
Answer: A) Had been running.
Answer: A) STUDYING
Answer: C) Had been raining.
Answer: D) Had been smoking'.
Answer: C) Had you been waiting long?
Answer: B) Hadn't been + verb's present participle.
Answer: C) Had been working.
Answer: A) Had/had been waiting.
Answer: B) Had been finished-arrived.
Answer: A) Had been waiting.
Answer: C) Had been typing.
Answer: A) Past Perfect Continuous Tense.