2. 外语
  3. Several days passed before those well-known experts______(想出解决问题的办法).

Several days passed before those well-known experts______(想出解决问题的办法).

admin2012-08-10  87
问题 Several days passed before those well-known experts______(想出解决问题的办法).
选项
答案came up with solutions
解析 come up with意为“得出……，想出……”，solution“解决办法”。因为主句的时态是过去时，根据时态一致的原则，从句的时态也 应为过去时。
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大学英语四级

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