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— ________ have you kept the book ? —Since last Month. I ____ return it to the library today or I ca...
题目内容：
— ________ have you kept the book ?
—Since last Month. I ____ return it to the library today or I can’t borrow one next time.
A. How often； must B. How long； have to
C. How soon； have to D. When； must
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