  We present our recent progress in the description of neutrino-nucleus
interaction in the GeV region, of interest for ongoing and future oscillation
experiments. In particular, we discuss the weak excitation of
two-particle-two-hole states induced by meson exchange currents in a fully
relativistic framework. We compare the results of our model with recent
measurements of neutrino scattering cross sections, showing the crucial role
played by two-nucleon knockout in the interpretation of the data.
