OG 12---2 关于that

xingxc11

Although a surge in retail sales have raised hopes
that there is a recovery finally under way, many
economists say that without a large amount of
spending the recovery might not last.
(A) have raised hopes that there is a recovery finally
(B) raised hopes for there being a recovery finally
(C) had raised hopes for a recovery finally being
(D) has raised hopes that a recovery is finally
(E) raised hopes for a recovery finally
我明白此题选D 但是我想深究一下，这句中的第一个that充当什么成分？

lynlin886

估计是引导同位语从句吧，that there is.... 来解释HOPE到底是什么。