--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

1、A

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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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