单选题 The young man told me a convincing story, but it seemed that he concealed his true motives.
【正确答案】 D
【答案解析】conceal：掩饰，掩盖；put up：举起，架起，安排……的住宿，进行，提出；take up：着手，占用，开始；pick up：捡起，接人，取，增加；cover up：掩盖。