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单选题交通银行

2016-05-07

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

A．product

B．producer

C．produce

D．productivity

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参考答案

D

答案解析

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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