Online shopping , when properly , can save a lot of time , money and energy.A. doneB. is d

发布时间：2020-08-16 20:12:15

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. done
B. is done
C. having done
D. doing
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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