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---Could you go to the bookshop with me? I want to buy The Grass House by Cao Wenxuan. ---Sorry, 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. (2016•镇江市)
A. can B. couldn't C. needn't D. mustn't
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