Firms that use computers have found that the number of staff______ is needed for

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问题 Firms that use computers have found that the number of staff______ is needed for quality control can be substantially reduced.

选项 A、whose
B、as
C、what
D、that

答案 D

解析题中修饰staff的定语从句中缺少主语，而D项that既可连接定语从句，又可充当从句中的主语，用来指人，符合题意。

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