Online shopping , when properly ____, can save a lot of time , money and energy. A. done B. is done ...
2023-01-14 12:09:54 51次 2011-2012学年宁夏高三第四次月考英语试题 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
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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