we had a three-day vacation last week和he was the first pianist in the 70-year history of the exam
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时间：2024-08-17 10:50:20
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we had a three-day vacation last week和he was the first pianist in the 70-year history of t
【专家解说】：1. three-day 是【数词+名词单数】构成的合成形容词
2. of 表所属关系
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