As a young man,Tom used to in the town, to find a job for a few coins.A.knocking about;waitedB.knocked down;waitingC.knock about;waitingD.knocked down;waited
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C解析根据句意“汤姆年轻时曾在镇上游荡，期待找份工作挣点钱”。“漫游”可用短语knock about,第二个空考查非谓语动词在句中作状语，表示一种伴随的动作，故用现在分词表示主动。