精英家教网 > 高中英语 > 题目详情
Online shopping , when properly ____, can save a lot of time , money and energy.
A.doneB.is doneC.having doneD.doing
A
考查状语从句的省略。此题when后面省略了it is,句意:网上购物当适当使用的话,会节省许多时间,金钱和精力。故选A。
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