当m=-1时，整式8m²-[4m²-2m-(2m²-5m)]的值是(    )

解：原式=8m²-(4m²-2m-2m²+5m)
=8m²-4m²+2m+2m²-5m
=6m²-3m．
当m=-1时，
原式=6×(-1)²-3×(-1)
=6+3
=9．
故选：D．

略