2. 外语
  3. 15. My key was missing, I ______ it in the office.

15. My key was missing, I ______ it in the office.

admin2009-06-28  42
问题 15. My key was missing, I ______ it in the office.
选项 A、should have left
B、could have left
C、must have left
D、need have left
答案C
解析 句子意为：我的钥匙不见了，我肯定是把它放在办公室了。must have done表示对过去发生的事情的推测。
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