单选题 He then ______ overalls (工作服) and spent the next eight hours as a dustman.
【正确答案】 A
【答案解析】[解析] 句意:然后他换上工作服,在接下来的八个小时里做清洁工作。词义辨析题。change into:变成,换衣服;exchange for:交换;alter:改变;turn into:(使)变成。