Online shopping, when properly , can save a lot of time ,money and energy..

A. done B. is done

C. having done D. to do

A

【解析】

試題分析：考查非謂語動詞辨析。A. done，過去分詞，表被動； B. is done，被動語態(tài)；C. having done，現(xiàn)在分詞的完成式，表示主動；D. to do不定式表示目的，主動關(guān)系。句意：在線購物，當(dāng)我們恰當(dāng)?shù)剡\(yùn)用的話，可以節(jié)省許多的時(shí)間，金錢和能力。由句意可知Online shopping與Do之間是被動的關(guān)系，故可排除選項(xiàng)C、D，再由于插入語中無主語，所以要用非謂語，故選A。

考點(diǎn)：考查非謂語動詞辨析。

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