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。
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