E-shopping, when properly ,can save us a lot of time and energy.A. doneB. doingC. to doD.

发布时间：2020-08-16 17:53:01

E-shopping, when properly      ,can save us a lot of time and energy.
A. done
B. doing
C. to do
D. is done

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(答案→)A. done
B. doing
C. to do
D. is done
解析：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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