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Correct Answer: C) Simple past.
Correct Answer: A) For.
Correct Answer: B) Has been sitting.
Correct Answer: B) Have been traveling.
Correct Answer: B) I've ever had to deal with.
Correct Answer: C) The main difference is the aspect of completion versus ongoing action.
Correct Answer: C) Studied.
Correct Answer: B) Ordering.
Correct Answer: A) Has been.
Correct Answer: A) Has been working.
Correct Answer: B) Had.
Correct Answer: C) Have tried.
Correct Answer: B) Have been discussing.
Correct Answer: C) Has known.
Correct Answer: B) Has been cleaning.
Correct Answer: C) Have, writing.
Correct Answer: A) Driving.
Correct Answer: A) Have been.
Correct Answer: B) Have been standing.
Correct Answer: B) Have.
Correct Answer: A) Has Tom been.
Correct Answer: B) Have been playing.
Correct Answer: B) Has.
Correct Answer: B) Have been.
Correct Answer: A) Has been riding.