Firms that use computers have found that the number of staff ______ is needed fo

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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

解析关系代词题。定语从句that is needed for quality control can be substantially reduced修饰限定staff，关系代词that在从句中作主语。因此，本题应该选择[D]。

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