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

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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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[originaltext]W:Wouldyouliketohavealookatourfactory?M:Sure,I’dlov