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

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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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