单选题 You ______ engage in serious debate or discussion unless you are willing to endure attacks.
  • A. have better not
  • B. had better not
  • C. have better not to
  • D. had better not to
【正确答案】 B
【答案解析】[解析] 本题考查情态动词用法，汉语意思是你最好不要卷入严肃的争论或者讨论之中，除非你愿意承受攻击。