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


  1. A.
    whose
  2. B.
    as
  3. C.
    what
  4. D.
    that
D
试题分析:通过分析句子结构,可知这个句子中包含一个定语从句。that在定语从句中作主语,故用that。
考点:定语从句的考查
点评: 限定性定语从句,that即可代表事物也可代表人,which代表事物;它们在从句中作主语或宾语,that在从句中作宾语时常可省略关系词,which在从句中作宾语则不能省略。而且,如果which在从句中作“不及物动词+介词”的介词的宾语,注意介词不要丢掉,而且介词总是放在关系代词which的前边,但有的则放在它原来的位置
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C
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A

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