The factory used 65 percent of the raw materials, the rest of which saved for the other p

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A. is
B. are
C. was
(答案→)D. were
解析：考查主谓一致。the rest of +名词作主语，谓语动词单复数看名词，如果名词是不可数名词，那么用单数；如果名词是可数名词复数，那么用复数。本题的which指代the raw materials，是复数形式，所以用复数，本句又是过去时，所以选择D。