单选题 Tom looked very much embarrassed when he was caught cheating in the exam ______ the spot.
  • A) on
  • B) by
  • C) at
  • D) in


【正确答案】 A
【答案解析】[译文] 汤姆在考试时被现场抓到作弊他看上去很尴尬。
[解析] on the spot是一个固定的词语搭配形式。