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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