M: When I think about it, I can’t believe that I didn’t have the ______ sense to at least put my car keys in my pocket, and I could have left my sunglasses in the car.

__________ in my brother’s position, I would have hung up the phone in the middle of the conversation. A: had I have been B: Have I been C: Had I been D: If I have been

I could find my umbrella nowhere. I ______ it in the taxi. A: should leave B: must have left C: could leave D: should have left

I forgot to give my regards to my manager in my letter.I wish I（）it. A: should do B: did C: have done D: had done

"My father and I only board here " can be regarded as "My father and I have only been here once "?