2. 外语
  3. I can’t believe my ears! You’ve passed the final examination! I think you ______ (study) a lot before you took it.

I can’t believe my ears! You’ve passed the final examination! I think you ______ (study) a lot before you took it.

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问题 I can’t believe my ears! You’ve passed the final examination! I think you ______ (study) a lot before you took it.
选项
答案must have studied
解析 本题考查虚拟语气的用法。句意理解，表示对过去发生事情的肯定推测，用must have done。该句意为：我简直不敢相信我的耳朵!你通过了期求考试!我想你参加考试前一定学习了很久。
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