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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