IR spectra of the CF₃CCH...N(CD₃)₃ complex dissolved in liquid argon were studied in large optical paths (l̄2 m). All relatively broad bands (Δ_1/2≥30 cm^-1) were ascribed to CH vibrations and their shapes were interpreted within the framework of a unified approach to the interaction of CH vibrations with low-frequency intermolecular modes. Occurrence of a triple resonance in the overtone region lends support to the conclusion that the Evans hole in the complicated contour of the v₇ CH bending mode results from the Fermi resonance v₇ ≈v₈+v₁₀ in the CF₃CCH molecule.