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?
這是一個含蓄虛擬條件句，通過介詞短語without,表示潛在的一種假設(shè)，而主句中的情況也早已經(jīng)發(fā)生，所以是對過去情況的一種假設(shè)，因此用would not have been achieved這一形式。?
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