  We construct a string-inspired nonsingular cosmological scenario in which an
inflaton field is driven up the potential before the graceful exit by employing
a low-energy string effective action with an orbifold compactification. This
sets up an initial condition for the inflaton to lead to a sufficient amount of
$e$-foldings and to generate a nearly scale-invariant primordial density
perturbation during slow-roll inflation. Our scenario provides an interesting
possibility to explain a suppressed power spectrum at low multipoles due to the
presence of the modulus-driven phase prior to slow-roll inflation and thus can
leave a strong imprint of extra dimensions in observed CMB anisotropies.
