-- Mum, must I stay there the whole day? -- No, you ______ . You ______ come back after lunch, if yo...
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题目内容：
-- Mum, must I stay there the whole day?
-- No, you ______ . You ______ come back after lunch, if you like.
A. mustn't; can
B. needn't; must
C. needn't; may
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