—Must I return the hook tomorrow morning...

—Must I return the hook tomorrow morning? —No, you _ .You can keep it longer.

A. mustn't B. can't C. needn't D. couldn't

C 【解析】试题句意：－我明天早上必须还书吗？－不，你不必，你可以保存久一点儿。A. mustn’t不准，不允许，禁止；B. can’t不能，不可能；C. needn’t 不必；D. couldn’t不能。“我必须吗？”“不，你不必”。故选C。

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