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一个但选题,请出示祥解45.Becauseofthecomplexityofthemodernmachine,mostofficesrequiresecretaries.A.tohavespecifiedtrainingB.specifiedintraing?C.totrainspecifiedlyD.trainingspecified?

题目详情
一个但选题,请出示祥解
45.Because of the complexity of the modern machine,most offices require secretaries ____.
A.to have specified training B.specified in traing?
C.to train specifiedly D.training specified?
▼优质解答
答案和解析
require后接虚拟语气,形式为should to do ,should可以省略