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

Firms that use computers have found that the number of staff______ is neeced 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 neeced for quality control can be substantially reduced.
选项 A、whose
B、as
C、what
D、that
答案D
解析 此句中，found后的that：引导的是宾语从句，从句中的“is needed for quality control”解释说明了“staff”，所以应为同位语从句，而引导词只能是that。故答案为D。
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