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We need to conduct extensive background research on the firms from___________we received bids.
A.which
B.where
C.that
D.when
B.where
C.that
D.when
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参考解析
解析：通过选项可以知道此题为选择恰当的关系代词的问题。介词from之前的结构为“主语+动词+宾语”，从而可以知道，from后面的部分为修饰先行词finns的关系代词从句。
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6.（）A
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