I think you are dealing with a strong base with a polyprotic acid with 3 acidic hydrogens.
so if you do a M1V1 = M2V2 you get, (10M)(V1) = (1M)(1mL)
therefore, V1=0.3mL
that is to neutralize one of the acidic hydrogens, so (3)(0.3mL)=0.9mL
is that the correct answer?