第6题: [单项选择]The students on the school bus were______for half an hour in the traffic so all of them were late for class that morning. A. held up B. kept off C. taken back D. put off 参考答案:A 答案解析:[解析] 四个选项的意思分别是：held up 举起；提出；拦截，使停滞。kept off 挡住，防止……接近。taken back拿回，退同。put off拖延；扔掉。根据句意，应该选择A。
