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 此句中,found后的that引导的是宾语从句,从句中的“is needed for qualitycontrol”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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