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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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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