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单选题
63.The new buyer identified a dozen new sources for the material, proved to be reliable.
A
A. most of them
B
B. most of which
C
C. most of whom
D
D. most of what
答案解析
正确答案：B
解析：
63.【翻译】 新的买方为材料确定了十二个新的来源，其中大部分来源被证明是可靠的，【精析】B分析句子结构并结合选项可知,这里考查的是“表示部分的词语+of +关系代词(which, whom)"引导 的非限制性定语从句，引导词指代先行词sources,指物，所以应用which。故选B。
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