— Must I return the book this week? — No, you ____. You can _ it for 20 days. A. mustn't: keep B. ne...
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题目内容：
— Must I return the book this week?
— No, you ____. You can _ it for 20 days.
A. mustn't: keep B. needn't; borrow C. needn't; keep D. mustn't; borrow
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