题目内容

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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