Ms. Arroya says that when workshop______begins to slow down, it may be time to hire more workers.

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问题 Ms. Arroya says that when workshop______begins to slow down, it may be time to hire more workers.

选项 A、product
B、producer
C、produce
D、productivity

答案D

解析在when引导的状语从句中，主语要表示“工厂生产力”时，才能和动词slow down搭配使用，因此D为正确答案。

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