摘要：20．E-shopping, when properly , can save us a lot of time and energy. A．done B．is done C．having done D．doing
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E-shopping, when properly , can save us a lot of time and energy.
A．done B．is done C．having done D．doing
查看习题详情和答案>>E-shopping, when properly _____ ,can save us a lot of time and energy.
| A．done | B．doing | C．to do | D．is done |
E-shopping, when properly ________, can save us a lot of time and energy．
[ ]
A．to do
B．is done
C．doing
D．done