By the end of last month, the factory(produce)______ more than 20,000 TV sets of

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问题 By the end of last month, the factory(produce)______ more than 20,000 TV sets of this model.

选项

答案 had produced／produced

解析考查过去完成时态的用法。根据句子的时间状语by the end of last month“到上月底”，可确定空格应为动词的过去完成时，故本题答案为had produced。

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