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    12． the situation become worse, call me at once. A．Must B．Need C．May D．Should 【查看更多】

     

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       the situation become worse, call me at once.

             A．Must             B．Need             C．May           D．Should

     

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       the situation become worse, call me at once.

           A．Must           B．Need            C．May          D．Should

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