We have gathered nearly 100,000 quilts, ___ up to half have gone to the flood-hit areas.
A.with which
B.in which
C.for which
D.of which
答案:D
which指代先行词quilts,介词of表示“部分”,定语从句的正常语序应该是up to half of which (=" 100,000" quilts) have gone to the flood-hit areas。