单选题 Williams had not been there during the ______ moments when the kidnapping had taken place.
  • A. superior
  • B. rigorous
  • C. vital
  • D. unique
【正确答案】 C
【答案解析】本题考的是形容词与名词的搭配。A意为“较高的”,B意为“严格的”,C意为“极为重要的”,D意为“唯一的”。根据题意,选项C为正确答案。