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