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— Do you think it is safe to shop online? — I think so. On Taobao, customers return goods with no qu...
题目内容：
— Do you think it is safe to shop online?
— I think so. On Taobao, customers return goods with no questions asked，but they ______ pay delivery costs.
A.can’t; can B.must; must C.can; have to D.mustn’t; can
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