8．E-shopping，when properly ________，can save us a lot of time and money．（　�。�
A．doingB．to doC．having doneD．done

分析 在恰當進行的情況下，網(wǎng)上購物能給我們省下很多時間和錢．

解答 答案是D．本題考查"連詞+分詞"的結構．"連詞+分詞"的結構在句中往往做狀語，屬于分詞做狀語；分詞做狀語時分詞的選擇是看分詞和句子主語之間的關系：分詞和句子主語之間是主謂關系（主動關系），用現(xiàn)在分詞；分詞和句子主語之間是動賓關系（被動關系），用過去分詞；本題中連詞when后的do和句子主語E-shopping之間是被動關系，所以答案選擇D．注意：1）"連詞+分詞"的結構中分詞前不能有任何形式的be動詞；2）注意區(qū)別，"疑問詞+to do"在句中起著名詞作用，做主語、賓語或表語，而"連詞+分詞"在句中充當狀語．

點評 首先判斷選項中的動詞在句中是以謂語還是非謂語形式出現(xiàn)，然后根據(jù)選項在句中的功能結合非謂語的基本用法做出合理的判斷．要關注常見非謂語動詞的搭配．

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