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    Without electronic computers，much of today’s__________advanced technology.?
    A．will not have been achievedB．have not been achieved?
    C．would not have been achievedD．had not been achieved?
    C?
    这是一个含蓄虚拟条件句，通过介词短语without,表示潜在的一种假设，而主句中的情况也早已经发生，所以是对过去情况的一种假设，因此用would not have been achieved这一形式。?
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