By the end of last month, our factory (produce)______3 000 motors.had produced由句

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问题 By the end of last month, our factory (produce)______3 000 motors.

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答案 had produced

解析由句首的时间状语可知，句子应用过去完成时，表示到过去某个时间为止已经发生或完成的动作，故空格处应填had produced。

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