单选题 I went there in 1984, and that was the only occasion when I ______ the journey in exactly two days.
  • A. must take
  • B. must have made
  • C. was able to make
  • D. could make
【正确答案】 C
【答案解析】本句是对客观事实的陈述，be able to表示客观做成某事的可能，符合题意。句子是过去时，所以排除A。could do表示主观愿望，must have done表示推断，均不合题意。