Firms that use computers have found that the number of staff ______ is needed for quality control can be substantially r

Firms that use computers have found that the number of staff ______ is needed for quality control can be substantially reduced.
[A] whose [B] as [C] what [D] that
选哪个?为什么?请翻译整句
英语人气:810 ℃时间:2019-12-13 05:13:00
优质解答
选d,that引导定语从句修饰staff
大概是“使用电脑的公司已经发现高位控制的配备职员数量实质上可以减少”
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