[解析]
(1)C 理解推断题.根据文章第一段"I used to carry a fresh suit to work with me so I could change if my clothes got wrinkled."可知他带了另外一套衣服,防止这一套有皱纹,就换上另外一套,说明他希望自己的穿着很整洁.故选C.
(2)A 细节理解题.根据第一段3,4行He hardly ever wears a necktie."I'm working harder than ever,"David says,"and I need to feel comfortable."可知穿休闲服装让他更舒服,很随意.故选A.
(3)D 理解推断题.根据文章第二段第一句Why have so many companies started allowing their employees to wear casual clothes?可知很多公司都允许工人穿休闲服.但是并没有说所有的公司都是支持这样做的.故D项内容不准确.