Giúp mình chọn đáp án và giải thích 3 câu này với. 1.I find myself at a loss to understand Harold’s behavior. A. I lost contact with Harold, so I couldn’t understand his behavior. B. I have to lose a lot to understand Harold’s behavior. C. I understood Harold’s behavior completely. D. I find Harold’s behavior quite incomprehensible. 2. He was driving so fast that he could have had an accident. A. An accident happened, and it was caused by his very fast driving B. He didn’t have an accident although he was driving very fast C. If he had been driving very fast, he would have had an accident. D. He wasn't driving slowly enough to avoid the accident. 3. But for his father’s early retirement, Richard wouldn’t have taken over the family’s business. A. Richard only took over the family’s business because his father decided to retire early. B. Richard didn’t take over the family’s business because his father decided to retire. C. His father retired early, but he ran the family’s business. D. Richard’s father didn’t want him to take over the family’s business despite his retirement.