Eshopping,when properly ( ),can save us a lot of time and en

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Eshopping,when properly ( ),can save us a lot of time and energy.
A.being done B.is done C.doing D.done
为什么,

Eshopping,when (it's) properly (done),can save us a lot of time and energy.
网上购物若操作得当能节省我们很多精力和时间.
中间逗号隔开的部分有点像插入语,可以这么理
Eshopping can save us a lot of time and energy when (it's) properly (done),
when...作状语
再问：主从句的省略是怎么回事
再答：我把句子顺序还原了，你看看这是不是主语从句，应该不是吧？呵呵在这里when后面省略了与主语指代相同是it和表被动的is，直接用过分表被动，合着整个when引导的从句作状语。
再问：怎么看句子缺状语还是宾语啊
再答：刚开始学英语要要求自己主动去分析句子的成分：主、谓、宾、定、状、补、表、同位、独立成分句子主要成分有两种形式：①主谓宾 ②主系表先把主干划出来再找其它成分，举个例子： Eshopping can save us a lot of time and energy when (it's) properly (done). ———— ———— ——————————— ———————————— 主语谓语双宾语(简宾+直宾) 时间状语
再问：什么事状语,句子里必须有这个成分么
再答：状语类型很多，大致有11种： 1. 时间状语 2. 地点状语 3. 方式状语 4. 原因状语 5. 结果状语 6. 目的状语 7. 比较状语 8. 让步状语 9. 程度状语 10. 频度状语 11. 伴随状语一个句子先考虑主干完整性(主谓宾/主系表)，再考虑添加修饰成分(定状补)。

Eshopping,when properly ( ),can save us a lot of time and en Online shopping,when properly＿,can save a lot of time,money ______（take）a bus there can save us a lot of time This can save students a lot of time and money.For universit save lot of time to look after my pets properly takes a lot of time中to look a She is patient and she can spend a lot of time ___[explain]t cars and buses can only move slowly when there is a lot of t travelling can bring us a lot of p_____ This makes sense in that people save a lot of time in shoppi it will save you a lot of time.为什么用you而不用?your If we write words on both sides of p ,we can save a lot