问题
选择题
E-shopping, when properly _____, can save us a lot of time and money. [ ]
A. doing
B. to do
C. having done
D. done
答案
答案：D
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E-shopping, when properly _____, can save us a lot of time and money. [ ]
A. doing
B. to do
C. having done
D. done
答案：D