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--Could you go to the bookshop with me? I want to buy The Grass House by Cao Wenxuan. --Sorry, I . I...
题目内容：
--Could you go to the bookshop with me? I want to buy The Grass House by Cao Wenxuan.
--Sorry, I . I've promised Mum to go home right after school.
A. can’t B. couldn't C. needn't D. mustn't
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