All day long， by the side of the road ， looking at the passing cars and people.
A. was he sitting
B. sat he
C. did he sit
D. he sat
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(答案→)A. was he sitting
B. sat he
C. did he sit
D. he sat
解析：考查倒装句。当表示地点的介词短语放在句首，且主语是名词时候，句子要构成全部倒装；当主语是代词不要全部倒装。根据句意可知使用进行时表示一直在做的事情。句意：一整天，他都坐在路边，看着来来往往的汽车和人。