Answer: D) Had not known.
Explanation for this question is being written.
Answer: B) Hadn't
Answer: A) He had never been.
Answer: B) Hadn't organised.
Answer: B) Hadn't had.
Answer: B) Hadn't been.
Answer: C) Had never seen.
Answer: C) Hadn't finished.
Answer: C) Hadn't seen.
Answer: D) Hadn't been.
Answer: A) I didn't apologise to John.
Answer: C) Had been cheated.
Answer: B) America named a president.
Answer: B) HAD NOT BOUGHT.
Answer: A) Hadn't slept.
Answer: C) Had been announced.
Answer: A) Hadn't been maintained.
Answer: B) Had never been.
Answer: B) Hadn't broken.
Answer: B) Had not.
Answer: B) Hadn't seen.
Answer: C) Had received.
Answer: A) Had not.
Answer: B) Subject + had + not + past participle.
Answer: A) Had not finished.
Answer: A) Hadn't experienced.
Answer: A) Hadn't finished.
Answer: D) Had not seen.
Answer: D) Hadn't ridden.
Answer: B) She had never seen a bear before she moved to Alaska.
Answer: C) Hadn't passed.
Answer: A) Wouldn't have been.
Answer: A) Had never been.
Answer: A) Had never thought.
Answer: A) Had broken.
Answer: A) Had never heard.
Answer: A) Hadn't read.
Answer: B) She had not finished her homework before the teacher arrived.
Answer: B) Had not run.
Answer: D) Had never been.
Answer: A) Hadn't cleaned.
Answer: B) Hadn't started.
Answer: A) Hadn't rained.
Answer: A) Hadn't gone.
Answer: B) Had never seen.
Answer: B) Hadn't done.
Answer: B) Hadn't arrived.
Answer: A) Had not slept.
Answer: A) SUBJECT + HAD + NOT + VERBS PAST PARTICIPLE + COMPLEMENT.
Answer: B) False
Answer: C) Hadn't met.
Answer: A) Hadn't seen.
Answer: A) Had, seen.
Answer: D) Had not came.
Answer: B) Had not seen.
Answer: A) Was/ had not seen.
Answer: A) Hadn't obtained.
Answer: C) Hadn't