We need to conduct extensive background research on the firms from______ we received bids.

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问题 We need to conduct extensive background research on the firms from______ we received bids.

选项 A、which
B、where
C、that
D、when

答案A

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"firms"的关系代词从句。

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