问题标题：
【wereinvented考点为被动语态对吗?Ifthalidomide_________(invent)today,itwouldneverbereleasedforhumanusebecausenewtestsonpregnantanimalswouldrevealthedangers.】
问题描述：
wereinvented考点为被动语态对吗?
Ifthalidomide_________(invent)today,itwouldneverbereleasedforhumanusebecausenewtestsonpregnantanimalswouldrevealthedangers.
董德斌回答：
wereinvented
虚拟语气用were代替was
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