The research director had the department________a thorough job in polling potential customers．

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问题 The research director had the department________a thorough job in polling potential customers．

选项 A、done
B、do
C、doing
D、did

答案B

解析当复合宾语的逻辑主语是施动者时，使役动词had要跟动词原形do。A是过去分词，C是现在分词，D是过去时。

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