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

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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