2. 外语
  3. My mobile phone is nowhere to be found.I (drop) ______ it when I was on the way home.

My mobile phone is nowhere to be found.I (drop) ______ it when I was on the way home.

admin2009-05-28  12
问题 My mobile phone is nowhere to be found.I (drop) ______ it when I was on the way home.
选项
答案must have dropped
解析 表示对过去事实的肯定判断用must have done。
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