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    14、We have sometimes accidents on this line, but no accidents          since last winter.

    A．occur                                                        B．have occurred     

    C．have been occurring                     D．are occurring

    14、B

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    We have sometimes accidents on this line, but no accidents          since last winter.

    A．occur                                                        B．have occurred     

    C．have been occurring                     D．are occurring

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