Firms that use computers have found that the number of staff __________ is neede

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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

解析语法结构。that is needed for quality control 为定语从句，修饰 staff。as 用作关系代词时先行词需有 such 或 the same 修饰。

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