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    ---Must we put up a sign by the riverside? --- . It’s very dangerous here. A. Yes, you must B. No, you mustn’t C. Yes, you can D. No, you needn’t 【查看更多】

     

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    --Must we put up a sign by the riverside?

    --      ．It’s very dangerous here．

    A．Yes, you must                                            B．No, you mustn’t

    C．Yes, you can                                              D．No, you needn’t

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