E-shopping, when properly _____ ,can save us a lot of time and energy
A.doneB.doingC.to doD.is done在线课程A
考查非谓语动词。逻辑主语E-shopping与do之间的关系为被动关系，故用过去分词，相当于when it is done properly，选A。
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E-shopping, when properly ,can save us a lot of time and energyA.doneB.doingC.to doD.is done
编辑：chaxungu时间：2026-04-24 13:00:43分类：高中英语题库
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