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英语选择题....Firmsthatusecomputershavefoundthatthenumberofstaff[]isneededforqualitycontrolcanbesubstantiallyreduced.A.whichB.asC.whatD.that社么啊....为社么...

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英语选择题....
Firms that use computers have found that the number of staff [ ]is needed for quality control can be substantially reduced.
A.which B.as C.what D.that
社么啊....为社么...
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答案和解析
我觉得选A吧~·定语从句,作主语,做成分.一般用 which~·