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

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

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问题 By the end of last month, our factory (produce) ______3 000 motors.
选项
答案had produced
解析 到过去某个时间为止已经发生或完成的动作要用过去完成时。
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