2. 外语
  3. I went to Paris in 2008, which was the only occasion when I ______ the journey in exactly three days.

I went to Paris in 2008, which was the only occasion when I ______ the journey in exactly three days.

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问题 I went to Paris in 2008, which was the only occasion when I ______ the journey in exactly three days.
选项 A、was able to make
B、must make
C、could make
D、must have made
答案A
解析 could和be able to的区别。could指“一般的能力”，通常不表示某人在某一场合设法做了某事。be able to专用于具体场合，尤其指“具有能力完成某件有难度的事情”，因此A是正确答案。本句是陈述过去事实，B中must多指现在或将来的情况，一般不用来表示过去必须做某事，据此排除。D中must have done sth．表示对过去行为的推测、猜想，不一定是事实，与句意不符。
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