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    【题目】Much labor would have been saved if the electronic computers_____________ before.

    A. had invented B. were invented

    C. should have been invented D. had been invented

    【答案】D

    【解析】

    试题分析：考查虚拟语气。句意：如果以前电脑被发明出来，更多劳动力就会被节省下来。本句考查的是if引导的条件状语从句的虚拟语气，当与过去事实相反的时候，从句使用过去完成时，主句使用“情态动词+have+done”。根据句意可知本句使用被动语态，故D正确。

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