Answer: B) Must have seen.
Explanation for this question is being written.
Answer: D) Must have experienced.
Answer: B) Must not have eaten.
Answer: E) Must have been left.
Answer: C) Must have.
Answer: A) Can't have been here.
Answer: A) Must have trained.
Answer: C) Would have listened.
Answer: A) Must have been.
Answer: A) Must have.
Answer: C) Must have cleaned.
Answer: A) Must
Answer: C) Must have been.
Answer: C) She must have gone home early.
Answer: D) Must have.
Answer: A) Must not have received.
Answer: B) Must have listened.
Answer: C) Must have had.
Answer: C) Must have studied.
Answer: A) Must have been read.
Answer: A) A
Answer: A) She must have forgotten.
Answer: A) Run
Answer: A) Can't have seen.
Answer: A) I must have seen him at school.
Answer: B) Must have left.
Answer: A) Must have borrowed.
Answer: B) Must have.
Answer: D) It must have been blown down by the wind.
Answer: B) It must have been Alex who sneaked into the office yesterday.
Answer: A) Couldn't have finished.
Answer: A) Must have enjoyed.
Answer: C) Can't have.
Answer: B) Must have told.
Answer: A) Must have passed.
Answer: A) Must have taken.
Answer: C) Must have dropped.
Answer: A) Have
Answer: B) Can't have seen.
Answer: B) Could have been, might have been, may have been, must have been.
Answer: D) Mor must have just arrived from Vallahan.
Answer: B) Must have been.
Answer: D) Can't have.
Answer: C) Must have gone.
Answer: B) Conjecture for past events (quite certain).
Answer: A) He must have eaten chocolate.
Answer: B) Must have heard.
Answer: A) Must have eaten.
Answer: C) Modal verb + have + past participle.
Answer: B) Was to have become.