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

2023-05-26

A. product
B. producer
C. produce
D. productivity

参考答案:D

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。