Online shopping , when properly ____, can save a lot of time , money and energy.
题型：不详难度：来源：
Online shopping , when properly ____, can save a lot of time , money and energy.| A．done | B．is done | C．having done | D．doing |
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答案
| A |
解析
| 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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