单选题 The lecture is so dull that he can't focus his attention on it.
  • A. depend
  • B. concentrate
  • C. rely
  • D. put


【正确答案】 B
【答案解析】本题是对常见动词的考查。Focus(on)集中于…，以一为焦点；depend(on)依靠，依赖；concentrate(on)集中于…；rely(on)信赖，依赖；put(on)穿衣，上演。