按要求改写句子9[/d5r:X0d*N
They have already bought some prawn in the market. （否定句）9[/d5r:X0d*N
They 9C1^)J1]-i1X(obought any prawns in the marker 9o)Q0p1x(V7W,m.9[/d5r:X0d*N