13．Wearing shoes _______ for the activity you are doing can help avoid some foot injuries to a large extent．（　�。�
A．designB．designingC．designedD．to design

分析 穿專門為你所從事的活動而設計的鞋可以最大限度地避免一些腳的傷害．

解答 答案：C
句中design是作shoes的后置定語，要用非謂語動詞；design和shoes構成動賓關系，要用表示被動的過去分詞．故選C．

點評 過去分詞是非謂語動詞的一種，表示被動或完成；done過去分詞的簡單式，表示與謂語同時或幾乎同時發(fā)生的動作；having been done過去分詞的完成式，表示先與謂語的動作．學習時，要注意區(qū)分和掌握．

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