2. 外语
  3. Firms that use computers have found that the number of staff ______ is needed for quality control can be substantially reduced.

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

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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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