She went to Europe in 1994, and that was the only occasion when she ______the journey alone.

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问题 She went to Europe in 1994, and that was the only occasion when she ______the journey alone.

选项 A、must take
B、must have made
C、was able to make
D、could make

答案C

解析 情态动词题。题干为并列复合句,后半句的主干为that was the only occasion。when引导的定语从句修饰the only occasion。根据句意可知,从句的意思是“那是她唯一一次——独自旅行”,因此排除A、B。比较C、D选项,题目意思表示“一时的能力”,即“在过去某时有某种能力,并顺利地完成某事”,所以用was able to,而could表示“可能性”。因此选C。
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