Ms. Arroya says that when workshop__________begins to slow down, it may be ti...

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问题 Ms. Arroya says that when workshop__________begins to slow down, it may be time to hiremore 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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