playing against strange 3-4-3

my opponent playing 3-4-3
-----GK-----
DL---DC---DR
ML-MC-MC-MR
--ST-ST-ST--

any advices?

noone who can help vs this 3w-4-3?

Why would this be considered strange?
Are the MCs strong?
Is he coming down the flanks?
Are the wingers strong?
What is your formation or strengths?