We have gathered nearly 100 000 quilts up to half have gone to the flood-hit areas. A. of

问题补充：

We have gathered nearly 100,000 quilts, up to half have gone to the flood-hit areas.

A. of which

B. in which

C. with which

D. for which

答案：

(答案→)A. of which

B. in which

C. with which

D. for which

解析：

这题考查定语从句中“介词+which”的用法，句意是：我们收集了近100，000床被子，其中有一半已经去了洪水泛滥地区。选A。