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

问题补充：

28. We have gathered nearly 100,000 quilts, up to half have gone to the flooded-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

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