Question 39: I won't be able to do anything unless I have a quiet room.A. If I have a quiet room, I won't be able to do anything.B. If I didn't have a quiet room, I will be able to do anything.C. If I has a quiet room, I be able to do anything.D. If I don't have a quiet room, I won't be able to do anything.Question 40: It started to rain an hour ago.A. It has rained for an hour.B. It have rain for an hour.C. It do rained for an hour.D. It did rained for a hour.