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I’m sorry, Bill. I _________ the book to you last week, but I was so busy that I forgot to do so. A．...
题目内容：
I’m sorry, Bill. I _________ the book to you last week, but I was so busy that I forgot to do so.
|
A．must have returned |
B．could return |
C．should have returned |
D．might return |
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