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

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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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大学英语三级B级

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